Sandsteppe War Riders is a rare Creature — Human Warrior card from March of the Machine Commander (MOC), collector number 126. Current market price: $0.14, TCGplayer market prices via Scryfall.
Trample At the beginning of combat on your turn, bolster X, where X is the number of differently named artifact tokens you control. (Choose a creature with the least toughness among creatures you control and put X +1/+1 counters on it.)