Frontline Medic

Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Whenever this creature attacks while saddled, put a +1/+1 counter on target creature.

Sacrifice this creature: Creatures you control with counters on them gain hexproof and indestructible until end of turn.

Saddle 1 (Tap any number of other creatures you control with total power 1 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)

When this creature enters, target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Vigilance

Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.

Sacrifice Boromir: Creatures you control gain indestructible until end of turn. The Ring tempts you.

Lifelink

Whenever you cast a spell from your graveyard, create a 1/1 white Spirit creature token with flying.

Sacrifice a Spirit: This creature gains indestructible until end of turn.