Kindred, Eternal Hunters

+1: Put a Mark counter on target creature or planeswalker. You gain 1 life.
-2: Kindred, Eternal Hunters deal 1 damage to up to 3 creatures. If a marked creature is dealt damage this way, deal an additional 3 damage.
-7: All creatures and planeswalkers without a mark gain indestructable until end of turn. This ability may be cast as an instant.