Jiri Zark, Tolltaker

Whenever a creature enters the battlefield under
an opponent's control, if Jiri Zark, Tolltaker is
untapped, tap Jiri Zark and create a Treasure
token.
At the beginning of each end step, if Jiri Zark is
tapped, you may pay {b/r}. If you do, untap it and
it deals 1 damage to each opponent.