Atogatog

Sacrifice an Atog creature: Atogatog gets +X/+X until end of turn, where X is the sacrificed creature's power.

Kobolds of Kher Keep

Hasran Ogress

Whenever Hasran Ogress attacks, it deals 3 damage to you unless you pay {2}.

Giant Strength

Enchant creature
Enchanted creature gets +2/+2.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Psychic Purge

Psychic Purge deals 1 damage to any target.
When a spell or ability an opponent controls causes you to discard Psychic Purge, that player loses 5 life.

Anger

Haste
As long as Anger is in your graveyard and you control a Mountain, creatures you control have haste.