Neheb, Dreadhorde Champion is a rare Legendary Creature — Zombie Minotaur Warrior card from War of the Spark (WAR), collector number 140. Current market price: $0.85 (foil $1.05), TCGplayer market prices via Scryfall.
Trample Whenever Neheb deals combat damage to a player or planeswalker, you may discard any number of cards. If you do, draw that many cards and add that much {R}. Until end of turn, you don't lose this mana as steps and phases end.