Roots of Life 
Enchantment
As this enchantment enters, choose Island or Swamp. Whenever a land of the chosen type an opponent controls becomes tapped, you gain 1 life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL