Deepfathom Skulker 

Creature — Eldrazi
Devoid (This card has no color.)
Whenever a creature you control deals combat damage to a player, you may draw a card.
: Target creature can't be blocked this turn. (
represents colorless mana.)
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL