Most Commander games are going to be done before Turn 22, so I dont think we need to worry about that
And the cost reduction actually matters for big tramplers like Balamb T-Rexaur and Coliseum Behemoth
Battle for Baldurs Gate is ideal for this, as it has an open-ended deckbuilding mechanic in the Choose a Background mechanic
But at the same time, Ive accumulated single copies of some really good blue spells for the time when I wanted to play on the dark side: I just recently traded for a Mana Drain, a card Ive secretly coveted for over twenty years, but thanks to a reprint I was able to pick up an Iconic Masters copy for a reasonable exchange
While Wulfgar's Melee does reward you for spreading the damage out, this deck doesn't really need to do that to function
Malik, Grim Manipulator is the Universes Within reprint of Negan, the Cold-Blooded