Mana Vault [Revised Edition] Duel If the player does

If the player does

You may spend mana as though it were mana of any type to cast creature spells

Set: New Phyrexia Type: Legendary Creature — Phyrexian Praetor Rarity: Mythic Cost: {5}{B}{B} Swampwalk (This creature can't be blocked as long as defending player controls a Swamp

then put a number of +1/+1 counters on Yule Ooze equal to that permanent's converted mana cost

create X 1/1 Sand Warrior creature tokens that are red

Mana Vault [Revised Edition] Duel If the player doesSet: Revised Edition Type: Artifact Rarity: Rare Cost: {1} Mana Vault doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault. At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you. {T}: Add {C}{C}{C}.