Ivy Elemental

In Commander, Ivy Elemental occupies the awkward space of a mana sink that does exactly one thing: make a big body. Green decks that generate absurd amounts of mana — Selvala, Heart of the Wilds, Zaxara, the Exemplary — can dump excess into it, but they almost always have more impactful outlets. Pauper is where Ivy Elemental finds its most legitimate home; the format's creature ceiling is lower, and an uncounterable-cost X spell at common can end a game on a flooded board. In Legacy, Modern, and Pioneer, it's never going to clear a constructed slot — the competition at every mana value is too stiff and a vanilla X/X simply doesn't close games fast enough.