Time Vault [Alpha Edition] Legendary Artifact Creature if that spell's mana cost

if that spell's mana cost or that ability's activation cost contains {X}

Set: Doctor Who Type: Legendary Creature — Time Lord Doctor Rarity: Mythic Cost: {1}{G}{U} Paradox — Whenever you cast a spell from anywhere other than your hand

Set: Phyrexia: All Will Be One Type: Legendary Creature — Phyrexian Praetor Rarity: Mythic Cost: {4}{G}{G} Trample

defending player exiles the top twenty cards of their library

Time Vault [Alpha Edition] Legendary Artifact Creature if that spell's mana costSet: Alpha Edition Type: Artifact Rarity: Rare Cost: {2} Time Vault enters the battlefield tapped. Time Vault doesn't untap during your untap step. If you would begin your turn while Time Vault is tapped, you may skip that turn instead. If you do, untap Time Vault. {T}: Take an extra turn after this one.