Xira, Masquerade Assassin

Flying
{1}{b}{r}{g}, Pay 2 life: Gain control of target
creature until end of turn. Untap that creature.
It gains haste until end of turn. Sacrifice it and
draw a card at the beginning of the next end
step if its toughness is less than Xira, Masquerade Assassin's power.
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Her targets are always too envious of her new dress to notice the dagger in their back.