Plate Spinning

Whenever you cast a spell, copy it and you may choose new targets for the copy. Then balance a card from outside the game on one of your fingertips. When that card falls or touches another card, sacrifice this enchantment.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oktk5f3dppb1hbfyk155c.