Zulgref, Onakke Soulcarver

Menace, skulk, deathtouch
At the beginning of your upkeep, you may
sacrifice a creature. If you do, look at the top X
cards of your library, where X is that creature's
power, reveal any number of artifacts from among them, put them into your hand, then put the rest
into your graveyard.
Whenever an artifact enters the battlefield, it
deals 1 damage to each player.