Circle of Confinement

When this enchantment enters, exile target creature an opponent controls with mana value 3 or less until this enchantment leaves the battlefield. Whenever an opponent casts a Vampire spell with the same name as a card exiled with this enchantment, you gain 2 life.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o49pk1x9jpb1hnbcr53ko.