Revenge of the Wastes

You may gain up to 3 life, with the life gained
this way being less than the number of basic
lands in target players graveyard. If the life
gained this way is less than the square root of the number of basic lands in the graveyard, the
player loses 4 life.
"You kill what feeds you, and you question why you
are starving?"
—Blackwater, humanoid oceandweller