Charix, the Raging Isle is a rare Legendary Creature — Leviathan Crab card from Secret Lair Drop (SLD), collector number 1927. Current market price: $3.06, TCGplayer market prices via Scryfall.
Spells your opponents cast that target Charix cost {2} more to cast. {3}: Charix gets +X/-X until end of turn, where X is the number of Islands you control.