Rhythm of the Wild is a uncommon Enchantment card from Ravnica Allegiance (RNA), collector number 201. Current market price: $4.52 (foil $8.67), TCGplayer market prices via Scryfall.
Creature spells you control can't be countered. Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.)