The Doom Slayer

Rip and Tear - Sacrifice target Demon, Devil, or Horror you control. Until end of turn, The Doom Slayer gains power and toughness equal to target sacrificed creature's power.

The Only Thing They Fear is You - Until end of turn, whenever The Doom Slayer is equipped, it gains Indestructible, Double Strike, and Rampage 2

All equipment cost {x} less to equip legendary creatures, where {x} is the amount of creatures sacrificed this turn.