Contaminated Sneak

Menace, deathtouch
{p/u}{p/u}{p/b}{p/b}: Contaminated Sneak gains "this
creature can't be blocked by creatures with
power less than the number of instant and/or
sorcery cards in your graveyard" and "whenever
this creature deals combat damageto a player,
target instant or sorcery card in your graveyard
gains flashback. The flashback cost is equal to
its mana cost."