Soulstealer

{u}{u},{t}: Soulstealer becomes a copy of target creature until end of turn, then that creature becomes a colorless Soulless 0/1 creature and loses all abilities until end of turn.
Whenever a creature enters the battlefield, you
may sacrifice Soulstealer. If you do, create a
token that's a copy of that creature, then that creature becomes a colorless Soulless 0/1 creature token and loses all abilities.