Aan, Mirrorlord

Flash
Creatures you control get +1/+1 for each mirror counter on Aan and have Changeling (This creature is all creature types at all times).
{2}{u}{u}, {t}: Aan, Mirrorlord gains the colors, abilities, and power and toughness of target creature. Put a mirror counter on it. Activate this ability only once each turn. You may pay {0} instead of this ability's activation cost if Aan, Mirrorlord entered the battlefield this turn.