Radiant Smite 

Instant
Destroy target creature with power 4 or greater. If you weren't the starting player, you gain 4 life.
Cycling
When you cycle Radiant Smite, if you weren't the starting player, you gain 2 life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL