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A bigger magic deck can dilute your best cards, which reduces your chances of drawing them at the right time

If Mox Opal leaves the format then Seat of Synod and friends are also safe to reenter the format, which would help Affinity with the loss and may help out new strategies as well

I like to run an emergency mass removal spell in most decks, this one too, and we have the three-cost sorcery above to play, that only destroy things with a toughness of 4 or more

Otherwise, the deck strategy is straightforward enough

summon Dragacius from your extra deck

That ability lets you pick once from four different effects: tapping or untapping a permanent, dealing 3 damage to each opponent, copying an instant or sorcery, or (presumably your last choice) putting Gandalf back on top of your deck