Vuliev, Minister of Debt

Whenever a creature enters the battlefield under
an opponent's control, indebt 1. (Put a debt
counter on target creature. It becomes indebted to you,
gains "{1}: Remove a debt counter from this creature.",
and "When this creature dies, you lose 1 life and each
opponent gains 1 life for each debt counter on it.")
Whenever a creature dies, if it was indebted to
you, return it to the battlefield tapped under
your control.