The Gunky Runner is a rare Legendary Creature — Slug Gamer card from Unknown Event (UNK), collector number RB04. Current market price: $49.05, TCGplayer market prices via Scryfall.
Ew-minance — When The Gunky Runner enters and at the beginning of the first upkeep in a game where it's your commander, shuffle three Gunk cards into each opponent's library. (Gunk is a colorless sorcery card with no mana cost and cycling {4}.) Whenever an opponent loses life, they shuffle that many Gunk cards into their library. Ready to run (You can have two commanders if both have ready to run.)