Until end of turn, they become 3/3 blue Bird creatures with flying, hexproof, and "Whenever this creature deals combat damage to a player, scry 1." (They're no longer planeswalkers
Dragonback Assault is a flavorful one that destroys most of the board that you'd be concerned about, and doubles as a dragon token dispenser
There are situations, however, where Crystal Dragon is not great
When attacking with a Confused Pokmon, you flip a coin: heads means the attack goes through normally (including any requirements such as discarding Energy), tails means the attack fails, your Pokmon does 30 damage to itself, and your turn ends
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If Ifrit has three or more lore counters on it, exile it, then return it to the battlefield (front face up)