Malachite Talisman

Malachite Talisman is a Commander card through and through — the longer the game and the denser the green-spell count, the more broken it becomes. In Legacy and Vintage it's technically legal but has never found a home; fair green decks in those formats don't cast enough spells in a single turn to make the untap triggers relevant, and combo decks have faster, more consistent engines. Commander is where Malachite Talisman warps games: a Marwyn, the Nurturer or Selvala, Heart of the Wilds player who resolves it and then casts two or three elves has effectively ended the game. Oathbreaker offers a similar long-game environment but a smaller card pool and faster closing speeds, so Malachite Talisman sees fringe play there in mono-green builds.