Warrior's Oath [Double Masters 2022] Swamp Another target creature you control

Another target creature you control gains toxic 1 and hexproof from that color until end of turn

When Naturalize the Phyresis enters the battlefield

Set: The Brothers' War Retro Artifacts Type: Artifact Rarity: Rare Cost: {4} Whenever you gain life

its power and toughness are each equal to the number of Forests defending player controls

Warrior's Oath [Double Masters 2022] Swamp Another target creature you controlSet: Double Masters 2022 Type: Sorcery Rarity: Mythic Cost: {R}{R} Take an extra turn after this one. At the beginning of that turn's end step, you lose the game. "I swear this before all gods old and new: I will fight to my last breath."