Arixmethes, Slumbering Isle is a rare Legendary Creature — Kraken card from Commander 2018 (C18), collector number 38. Current market price: $0.67, TCGplayer market prices via Scryfall.
Arixmethes enters tapped with five slumber counters on it. As long as Arixmethes has a slumber counter on it, it's a land. (It's not a creature.) Whenever you cast a spell, you may remove a slumber counter from Arixmethes. {T}: Add {G}{U}.