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I would actually argue that Armada Wurm is the more proactive of the two and that Centaur Healer is more of a sideboard card (though it depends substantially on the tenor of the metagame)

Doomwake Giant, Culling Ritual, Extinguish All Hope, Cacophony Unleashed 5 board wipes

In fact, Primeval Titan has been the face behind some of the most degenerate decks in Modern, starting with the Cloudpost deck that was prevalent in the initial days of the format, to the Red-Green Valakut deck, and then the Amulet Titan deck both in its degenerate form with Summer Bloom, and the more toned down version we see today with Dryad of the Ilysian Grove and Urzas Saga

Now youre drawing a card every turn while also putting your opponent on a clock

The best dual lands for Commander differ significantly from Modern or Standard options due to card pool restrictions

It has earned its place in every deck that wields the power of the swamp.