Card trick

You summon a card of magic. You can throw the card with a range of 90ft. when thrown you make a spellattack. on a hit the cards deal 1d8+ your spellcasting modifier slashing damage. on a miss the card disappears. 
at character level 3 you throw 2 cards, at level 7 you throw 3, at level 11 you throw 4, at and level 13 you throw 5 cards.