The Great Henge [Throne of Eldraine] Plains Swamp Forest Exile them at the beginning

Exile them at the beginning of the next end step

for each opponent other than defending player

You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs

I've seen the other side

Set: Double Masters Type: Creature — Kor Artificer Rarity: Rare Cost: {1}{W} When Stoneforge Mystic enters the battlefield

The Great Henge [Throne of Eldraine] Plains Swamp Forest Exile them at the beginningSet: Throne of Eldraine Type: Legendary Artifact Rarity: Mythic Cost: {7}{G}{G} This spell costs {X} less to cast, where X is the greatest power among creatures you control. {T}: Add {G}{G}. You gain 2 life. Whenever a nontoken creature enters the battlefield under your control, put a +1 +1 counter on it and draw a card.