Ultra Beast Nihilego

Worm Hole —At the beginning of your upkeep,
you may exile Ultra Beast Nihilego from your
hand. At the beginning of combat on your turn
you may pay {1}{b}{g}. If you do, put Ultra Beast Nihilego from exile onto the battlefield under
your control tapped and attacking. Sacrifice it at
the end of combat.
Whenever Ultra Beast Nihilego dies, put a -1/-1 counter on each creature that blocked this turn.