Oath of Teferi [Dominaria Promos] San Diego Comic-Con 2013 Note the number and kind

Note the number and kind of counters that were on that creature

Duplicant has the power

Hellfire deals X plus 3 damage to you

Set: Core Set 2019 Promos Type: Legendary Creature — Dragon Rare Cost: {4}{R}{R} Flying Whenever another nontoken Dragon enters the battlefield under your control

but her freedom came at a price—him

Oath of Teferi [Dominaria Promos] San Diego Comic-Con 2013 Note the number and kindSet: Dominaria Promos Type: Legendary Enchantment 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."