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There are a lot of powerful upgrades to the archetypes tackled with these Commander decks, like Inventory Management for equipment decks and Strong Back for Voltron decks, but as far as universal cards go, there arent a lot here

[casthaven]Nykthos, Shrine to Nyx[/casthaven]

In an Aura deck her ETB trigger to dig 7 cards deep and yoink an Aura card from them should have a high success rate even without topdeck manipulation (though it never hurts to have!)

This pairs very well with our commander's triggered ability, that will keep on chipping away at our opponent's' life points while we easily mitigate the damage it deals to us