Brainwashed

' Gain control of target creature until end of
' turn. Untap it, it gains haste and "Whenever
' one or more creatures would be dealt damage
' by this creature and dies. Put a Brainwashed
' counter on it." until end of turn. You gain
' "On your upkeep, gain control of all
' creatures with Brainwashed counter on it.
' Remove Brainwashed counter from it
' afterwards." until end of your next turn.