Kalamax, the Stormsire is a mythic Legendary Creature — Elemental Dinosaur card from The List (PLST), collector number C20-9. Current market price: $0.63, TCGplayer market prices via Scryfall.
Whenever you cast your first instant spell each turn, if Kalamax is tapped, copy that spell. You may choose new targets for the copy. Whenever you copy an instant spell, put a +1/+1 counter on Kalamax.