Oath of Teferi [Dominaria Prerelease Promos] Magic Player Rewards 2009 Whenever a creature dealt damage

Whenever a creature dealt damage by equipped creature this turn dies

you may discard a card

Hex Parasite gets +1/+0 until end of turn

that player chooses target player whose graveyard has fewer creature cards in it than their graveyard does and is their opponent

prevent that damage

Oath of Teferi [Dominaria Prerelease Promos] Magic Player Rewards 2009 Whenever a creature dealt damageSet: 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."