If were going to play with a clunky, card-advantage-heavy curve, it might be worthwhile to include as many one- and two-mana spells as possible
It seems counterintuitive at first, in a game of card advantage, to two-for-zero yourself, especially in Commander, when exchanges that work in 1v1 formats put both players behind in the multiplayer calculus
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Every bird even has a non-ex variant
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions