Shoggoth, Protoplasmic Horror

Shadow
Ingest 2 (when this creature deals combat damage to a player, that player exiles the top card of their library face up.)
{b}: As an additional cost, sacrifice target creature. Shoggoth gets +X/+Y, where X is the sacrificed creatures toughness and Y is that creature’s power until the next endstep.
"It was a terrible, indescribable thing vaster than any mountain..."