Keldon Champion is a uncommon Creature — Human Barbarian card from Eternal Masters (EMA), collector number 135. Current market price: $0.07 (foil $0.25), TCGplayer market prices via Scryfall.
Haste Echo {2}{R}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, it deals 3 damage to target player or planeswalker.