Two cards to pay attention to here are Eternal WitnessEternal Witness and ArchaeomancerArchaeomancer

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Elves decks benefit, too, and if you get mana equal to the number of counters like with Gyre Sage, you can even buy a cost reduction on future activations
Enchantment themes lean into green's strengths, while artifact themes lean into red's, so the choice of streamlining the deck may depend upon your favorite color for modifications
the dread Stuffy Doll, which I own a copy of to this day