Slaughter-Priest of Mogis is a uncommon Creature — Minotaur Shaman card from Theros Beyond Death (THB), collector number 227. Current market price: $0.09 (foil $0.38), TCGplayer market prices via Scryfall.
Whenever you sacrifice a permanent, this creature gets +2/+0 until end of turn. {2}, Sacrifice another creature or an enchantment: This creature gains first strike until end of turn.