Aquatic Incursion is a uncommon Enchantment card from Rivals of Ixalan (RIX), collector number 32. Current market price: $0.17 (foil $0.44), TCGplayer market prices via Scryfall.
When this enchantment enters, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.) {3}{U}: Target Merfolk can't be blocked this turn.