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Mirrorwing Dragon 3RR Creature Dragon 4/5 Flying Whenever a player casts an instant or sorcery spell that targets only Mirrorwing Dragon, that player copies that spell for each other creature he or she controls that the spell could target

Not only does this do something when it enters, it can also be effective in combat right away

Ulalek, Fused Atrocity asks that you hold out from playing your biggest eldrazi until you have an extra Sol Ring, two more Eldrazi Spawn, or Palladium Myr

And later, it fetches game-ending threats

If you have enough of these card-drawing spells in your deck, one will draw you into another into another and you'll never have to worry about suffering from mana flood