The Doom Slayer

Haste, Menace, Hexproof

The Doom Slayer has indestructible as long as it is the only creature you control.

When The Doom Slayer enters it fights up to X target creatures you don't control.

Whenever a creature delt damage by The Doom Slayer dies draw a card, if that creature was a demon, put a +1/+1 counter on The Doom Slayer and draw an additional card.