Monarch of the Dire Swarm

Deathtouch
When Monarch of the Dire Swarm enters the
battlefield, sacrifice any number of Foods. For
each Food sacrificed this way, create a 1/1 black
Rat creature token.
Whenever a creature an opponent controls dies,
you may pay {b}. If you do, create a Food token.
(It’s an artifact with "{2},{t}, Sacrifice this artifact:
You gain 3 life.")