Voice of Resurgence is a mythic Creature — Elemental card from Secret Lair Drop (SLD), collector number 1258. Current market price: $5.35 (foil $8.65), TCGplayer market prices via Scryfall.
Whenever an opponent casts a spell during your turn and when this creature dies, create a green and white Elemental creature token with "This token's power and toughness are each equal to the number of creatures you control."