Deathlock of Hate

Vigilance
Pay {b}{b}: Target creature gains X 0/-1 counter
where X is its loyalty to white.
Whenever a Swamp enters the battlefield,
search your library for a basic land card, reveal
it, put it in your graveyard, then shuffle your
library. For every card destroyed this way
create a 2/2 black Undead Wraith token.