Kataki, War's Wage - 24 R MD1

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {1}."
"Before the war, we prayed to Kataki to sharpen our swords and harden our armor. Without his blessing our weapons are all but useless against the kami hordes."
—Kenzo the Hardhearted
rare
Legendary Creature — Spirit
From the Magic: The Gathering set Modern Event Deck 2014.