(Leechridden Volcano isn't a spell.)

Whenever Leechridden Volcano becomes tapped, it deals 1 damage to you.

Discard two cards: Put a 2/2 black Zombie creature token onto the battlefield.

, Pay 1 life, Sacrifice Leechridden Volcano: Search your library for a Swamp or Mountain card and put it onto the battlefield, then shuffle your library.