Nantuko Shrine is a rare Enchantment card from Odyssey (ODY), collector number 256. Current market price: $2.14 (foil $34.99), TCGplayer market prices via Scryfall.
Whenever a player casts a spell, that player creates X 1/1 green Squirrel creature tokens, where X is the number of cards in all graveyards with the same name as that spell.