Charix, the Raging Isle is a rare Legendary Creature — Leviathan Crab card from Zendikar Rising Promos (PZNR), collector number 49p. Current market price: $1.00 (foil $3.00), 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.