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ripplefoil
Aurora Shifter
Creature — Shapeshifter
Whenever this creature deals combat damage to a player, you get that many {E}. At the beginning of combat on your turn, you may pay {E}{E}. When you do, this creature becomes a copy of another target creature you control, except it has this ability and "Whenever this creature deals combat damage to a player, you get that many {E}."