Mox Tantalite [Modern Horizons] Urza's Power-Plant You may have Phyrexian Metamorph

You may have Phyrexian Metamorph enter the battlefield as a copy of any artifact or creature on the battlefield

if Mana Vault is tapped

These lands hold nothing that can stand against me

Sleeper Agent enters the battlefield under the control of an opponent of your choice

planeswalkers you control

Mox Tantalite [Modern Horizons] Urza's Power-Plant You may have Phyrexian MetamorphSet: Modern Horizons Type: Artifact Rarity: Mythic Suspend 3{0} (Rather than cast this card from your hand, pay {0} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.) {T}: Add one mana of any color.