Necrin, Lord of Plagues

Whenever a creature you control deals damage to a player, put a -1/-1 counter on each creature that player controls.
When a creature dies, if it had a -1/-1 counter on it, search you library for a basic land card and put it onto the battlefield and put a -1/-1 counter on target creature. Shuffle your library.
{2}{t}Put a necrosis counter on target creature. That counter stays on it in any zone except exile, command, hand, and library.