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These are mechanically unique cards that will be legal in Eternal formats.

We also have Territory CullerTerritory Culler, which can get more Eldrazi to our hand when we drop lands, and From BeyondFrom Beyond, which can make Scions and be sacrificed to search for an Eldrazi

If I had to choose which ones make it into a deck, I'm certainly choosing the latter over the former

-1/-1 counters, Planeswalker loyalty, Saga lore, and even Poison counters can all be proliferated

When Atarkas not killing players with commander damage, its usually doing a good job of giving your other dragons double strike, which means it even has an impact on combat the turn it comes into play