Ajani, Mentor of Heroes

Planeswalker - Ajani (Loyalty: 4)

+1: Distribute three +1/+1 counters among one, two, or three target creatures you control.

+1: Look at the top four cards of your library. You may reveal an Aura, creature, or planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

-8: You gain 100 life.

Ajani's Presence

Instant

Strive - Ajani's Presence costs more to cast for each target beyond the first.

Any number of target creatures each get +1/+1 and gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Agent of Erebos

Enchantment Creature - Zombie

Constellation - Whenever Agent of Erebos or another enchantment enters the battlefield under your control, exile all cards from target player's graveyard.

Erebos's minions hunt the Returned and warn those who consider the same folly.

Aerial Formation

Instant

Strive - Aerial Formation costs more to cast for each target beyond the first.

Any number of target creatures each get +1/+1 and gain flying until end of turn.

Aegis of the Gods

Enchantment Creature - Human Soldier

You have hexproof. (You can't be the target of spells or abilities your opponents control.)

Athreos cares little for the other gods' conflict with mortals. He is concerned only with safe passage for the dead.