Knowledge Vault (281) [Legends] The Brothers' War Whenever a creature you control

Whenever a creature you control of the chosen type enters or attacks

Set: The List Type: Artifact — Equipment Rarity: mythic Cost: {1} Equipped creature gets +3/+3 and has protection from each color that's not in your commander's color identity

Then that player shuffles

lifelink When Atraxa enters

Whenever you gain life

Knowledge Vault (281) [Legends] The Brothers' War Whenever a creature you controlSet: Legends Type: Artifact Rarity: rare Cost: {4} {2}, {T}: Exile the top card of your library face down. {0}: Sacrifice this artifact. If you do, discard your hand, then put all cards exiled with this artifact into their owner's hand. When this artifact leaves the battlefield, put all cards exiled with it into their owner's graveyard.