Keevala, the Blightbringer

Whenever you cast an instant or sorcery
spell, you may pay {u/b}. If you do, put a -1/-1
counter on target creature you don't control.
Whenever a creature with a -1/-1 counter on it
dies, you draw a card, discard a card, and you may
put a land card from your hand into play tapped.
"As you have destroyed this land, I will do the same
to you. NOW ROT!"