Oath of Teferi [Dominaria Prerelease Promos] Kaladesh Prerelease Promos or planeswalker

or planeswalker

Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi

If Chandra has dealt 3 or more damage this turn

Its controller gains life equal to its power

then put all cards exiled with Knowledge Vault into their owner's hand

Oath of Teferi [Dominaria Prerelease Promos] Kaladesh Prerelease Promos or planeswalkerSet: Dominaria Prerelease Promos Type: Legendary Enchantment Rarity: Rare Cost: {3}{W}{U} When Oath of Teferi enters the battlefield, exile another target permanent you control. Return it to the battlefield under its owner's control at the beginning of the next end step. You may activate the loyalty abilities of planeswalkers you control twice each turn rather than only once. "For the lost and forgotten, I will keep watch."