Waves of Aggression [Eventide] Emperors in the New World and it's a colorless Eldrazi

and it's a colorless Eldrazi creature

Set: Fifth Dawn Type: Artifact Rarity: Uncommon Cost: {4} Sacrifice an artifact: Add {C}{C}

Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands

Whenever a Dragon enters the battlefield under your control

Equipped creature gets +1/+1 and has haste

Waves of Aggression [Eventide] Emperors in the New World and it's a colorless EldraziSet: Eventide Type: Sorcery Rarity: Rare Cost: {3}{R W}{R W} Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase. Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)