Rin and Seri, Inseparable [BABP - 278] SL10 Rules Text Contains: Can be

Rules Text Contains: Can be cast only when a creature or spell does damage to you

Property: Atlantis

Whenever a land enters the battlefield under an opponent's control

Sacrifice this land: Search your library for a Plains or Swamp card

and Elves of Deep Shadow do 1 damage to you

Rin and Seri, Inseparable [BABP - 278] SL10 Rules Text Contains: Can beRarity: P #: 278 Creature Type or Sub Type: Legendary Creature Dog Cat P: 4 T: 4 Rules Text Contains: Whenever you cast a Dog spell, create a 1 1 green Cat creature token. Whenever you cast a Cat spell, create a 1 1 white Dog creature token. RGW, T: Rin and Seri, Inseparable deals damage to any target equal to the number of Dogs you control. You gain life equal to the number of Cats you control.