Question

How to summon Rainbow Dragon in Yugioh Duel Links @vocaloid
This is a tutorial for educational purposes only.
As with any dueling strategy, the first step towards victory is proper deck composition. Usually in DL, you want to keep your deck as close to 20 cards as possible, in order to make your strategy more consistent and decrease the chances of drawing into a 'dead hand'. Since the Crystal Beast archetype has a lot of cards that allow you to search the deck, you may be able to benefit from an extra card or two, but you'll have to consider carefully whether or not it is worth the sacrifice in consistency.
Now, on to the cards themselves. Of course, we'll need a copy of Rainbow Dragon, along with the seven crystal beasts, if we want to summon Rainbow Dragon. So that's 8 cards already, nearly half our total deck. Speaking of the crystal beasts, there are a few you'll definitely want to run multiple copies of. The three most valuable to have are Sapphire Pegasus, which allows you to instantly search out a crystal beast to put into your backrow, is almost essential to pull this off. You essentially get two beasts for the price of one. You can put up to three of these in your deck. Its effect and stats make it a solid choice. Next, we have Amber Mammoth and Topaz Tiger. These are arguably the best of the bunch, stat-wise. Tiger will be your main source of offense, with a boosted 2000 atk when attacking. Mammoth's ability can be useful for keeping other CB's on the field, particularly Cobalt Eagle and, to a lesser extent, Amethyst Cat. I'd recommend running two each of Tiger and Mammoth. The other four beasts do have their utilities which I will discuss, but they don't really justify running more than one each.
As for other support cards, you'll want to run as many copies of Crystal Release as you have. It's essentially an 800 atk boost with Pegasus' effect when it's destroyed. Crystal Beacon is also very good. It's a bit more situational than Crystal Release, but it has the benefit of summoning a monster to the field, rather than the backrow.

Answer 1

Additionally, you can get some very nice combos using Crystal Beacon with the right setup. For instance, if you happen to have a Sapphire Pegasus in your backrow, along with another crystal beast, you can play Beacon to special summon Ruby Carbuncle. When Carbuncle is special summoned, you can special summon as many Crystal Beasts as possible from your backrow. Use this ability to bring back Pegasus, then use Pegasus' ability to search another Crystal Beast from the deck. Adding your normal summon from that turn, that's potentially three new Crystal Beasts from a single play. Talk about value!
Another handy tool for your deck would be Crystal Path. It's most useful for searching out Rainbow Dragon directly, and you only need to have one Crystal Beast in the backrow to activate it. Even if you drew into RD already, it can still be useful for negating an attack or clearing out your backrow.
Speaking of keeping your backrow clear, I would not recommend running Crystal Tree, the last CB support card currently. It's essentially a worse Crystal Beacon. It's a continuous spell which means it clogs up a space until you can activate it, and it adds the searched card(s) to the backrow rather than summoning it.
More on the topic of backrow, it can be very easy to have all your spell/trap zones filled with Crystal Beasts. This essentially means you can only use monsters for the rest of the duel, which is a severe handicap. Luckily, there are some cards that clear your own backrow while also making a positive impact to the board in other ways. Cards like Storm, Parallel Twister, and Double Cyclone have one or more backrow cards as a 'cost' to destroy one or more of your opponent's cards. Since Rainbow Dragon requires the Crystal Beasts to be on the field *or* your graveyard, this is effectively no cost at all.

Answer 2

*Tribute to the doomed and other discard-cost cards can be useful for the same reason.

Answer 3

If you want to expand past the bare necessities, there are a few cards with limited Beast support potential. Desmanian Devil has an effect that lets you add any Beast card to your hand each time it destroys a monster by battle. This sounds very good at first glance, but taking into account the fact that DD has a relatively low 1700 atk and, more importantly, the fact that 3 of the 7 Crystal Beasts are not Beast-type at all, this card becomes rather situational.
In the same vein, you might consider a spell like "Wild Nature's Release". Its effect applies to Beast or Beast-Warrior types. For a single turn, the monster targeted by this card gains atk equal to its def, and the monster is destroyed at the end of the turn. Again, only 4 of the 7 'Beasts' are actually beasts, but this card can be useful if you really need to get rid of a big beater, you need an atk boost to close out a duel, or you want to intentionally sac one of your monsters to get it into the backrow, to use Crystal Beacon or Parallel Twister. More rarely, you may also be able to use the card to destroy one of your opponent's Beasts or Beast-Warriors.

Personally, I like to run 1 Rainbow Dragon; 2 Sapphire Pegasus; 2 Amber Mammoth; 2 Topaz Tiger; 1 Emerald Tortoise; 1 Cobalt Eagle; 1 Amethyst Cat; 1 Ruby Carbuncle; 1 Tribute to the doomed; 1 Parallel twister; 2 Crystal beacon; 2 Crystal release; 1 Gravity lash; and 1 Rainbow path.
The Gravity lash could be swapped for something else, like maybe an extra copy of Crystal release (I only have 2 atm) and you may get away with adding a card or two, but overall I think this setup works.
All of the CB cards can be obtained by leveling-up Jesse. The other cards can be obtained from boxes and ranked duels (refer to the in-game card catalog for more details)

Answer 4

Now, to actually playing the deck. You definitely want to get at least one of either Pegasus, Tiger, or Mammoth in your first draw. If the deck matches the one I suggested, that's 6 out of 20 cards, a pretty fair chance. In most cases, you'll want to play Pegasus as soon as possible. Firstly, this eliminates the chance of drawing into Crystal Beasts with limited or situational use, such as Cat or Tortoise. Secondly, this sets you up to combo into Crystal Beacon in the event that Pegasus is destroyed.
Tiger's and Mammoth's uses are pretty self-explanatory. Tiger is good on offense, but rather fragile on defense, so you'll want a reliable way to keep him alive. A Mammoth buffed up with Crystal Release can be a difficult wall for your opponent to surmount, with 2500 atk and an ability that makes it the only monster your opponent can target for attacks.
Ruby Carbuncle is mainly used for reviving Crystal Beasts from the backrow, but it needs to be special summoned in order to activate this effect. If you draw into it, tough luck.
Cobalt Eagle can return Crystal Beasts to the top of your deck, whether they are being treated as monsters or continuous spells. This makes it a slower version of Ruby Carbuncle and can also pair with Sapphire Pegasus, which searches out a new Beast every time it is summoned.
Emerald Tortoise boasts solid defense but no ability, so it's mainly used to stall while you wait to draw better cards.
Amethyst cat is just bad. It has a pretty pathetic 1200 atk, which would be made up for by its ability to attack your opponent directly, but the damage it does when using this ability is halved. Unless you can combo this card with Amber Mammoth, it'll usually be destroyed in one turn, with an equivalent loss of life points to you. But if you have a Mammoth already on the field, you're probably in a good enough position to not need Amethyst Cat. Worst gem confirmed.

Answer 5

Even using the Crystal Beasts to their full potential, it'll be at least 3-4 turns before it's even possible to summon Rainbow Dragon, under optimal conditions. Many games, however, you'll see that you're able to win before you even get the chance to bring out RD.
As a final note, there are some skills you can use to increase your chances of success with this deck. Jesse's level 13 skill, the tie that binds, increases all your monster's attack by 100 for each monster on the field, until the end of your turn; you can use this skill each and every turn. Since Crystal Beasts are excellent at swarming the board, this is effectively a +300 to each of your monsters. Very few 4-star monsters will be able to survive an attack from that, especially if you also have Crystal Release.
The Crystal Beasts' swarming abilities also open it up to some weaknesses. Cards like Disruption Wave or Radiant Mirror Force, which depend on your opponent having lots of monsters on the field, can be a major setback. These cards can be played around, simply by having one or more of your monsters switched to defense position. Even if you get hit with an entire board-clear, it's not unlikely that you'll be able to get 3 Crystal Beasts back on the field the very next turn.

Keeping in mind all these tips and tricks, I'm sure you'll be getting out your Rainbow Dragon in no time!

Answer 6

Well done

The only way to get some of the spell support cards is to level up Jesse right

RIP

Answer 7

Well, yeah, you could wait until the next time his event comes around, but as of now that's the only way to get them.

Answer 8

Also, right now there's the 1.5* exp campaign, so you can get some quick levels off of that. I'll also send lots of broken vaganabonds your way to help with the exp