Bog Boi, Swamp Dweller

Deathtouch
Whenever you cast a spell, think about where
you came from.
If you imagine a fetid swamp, you win the game.
If you imagine anything other than a fetid
swamp, you die in real life.
—
"You're more than the swamp," said Michael.
"No," replied Bog Boi. "The swamp is all there is."