Straight out of the gate, Unrivaled Lethality doubles all damage that this card deals (and that can stack with double strike), not just combat damage, making it actually more like a 4/2 for three mana, but thanks to its next ability to easily get more counters when it deals damage to another creature which can quickly make this card a powerhouse
While Sapphire is a color known for its items, Steel is not
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Mutational Advantage Mutational Advantage only fits into a small slice of Simics design space, but +1/+1 counter decks are quite popular for the color pair, with several Simic commanders caring about counters
Possibly I couldve gone with the Innistrad battle of White cathars against Black creatures of the night which I also considered for Cleanse but first and foremost what came to my mind was the recent March of the Machine, and in particular Elesh Norns Machine Orthodoxy
we just need to find the right ones