Oracle

Instant 

Target opponent sacrifices a creature. If you control a creature with power 4 or greater, you gain 4 life.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

1/25/2019
You can still gain 4 life even if the target opponent can’t sacrifice a creature.

1/25/2019
Whether you control a creature with power 4 or greater is checked only after your opponent has sacrificed a creature. If a creature you own with power 4 or greater was exiled until the sacrificed creature left the battlefield, that creature will return to the battlefield before the check, so it will count. However, any abilities that trigger on the sacrificed creature’s death won’t have resolved yet when you check what creatures you control.

1/25/2019
You gain only 4 life, even if you control more than one creature with power 4 or greater.

Decktips