Umbra, God of Misery

Ward: Pay 10 life.
{4}{p/b}{p/r}: Monstrosity 11
Whenever a creature dies, you may pay {p/b}{p/r}.
If you do, destroy another creature. It can’t be regenerated. If there are no other creatures on
the battlefield, you win the game.
Any {p/b} or {p/r} symbols on cards in play must
be payed with life or 4 mana of that color.