The Earth Crystal is a rare Legendary Artifact card from Final Fantasy Promos (PFIN), collector number 184s. Current market price: — (foil $23.99), TCGplayer market prices via Scryfall.
Green spells you cast cost {1} less to cast. If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead. {4}{G}{G}, {T}: Distribute two +1/+1 counters among one or two target creatures you control.