Genku, Future Shaper Genku, Future Shaper has a hard cap on its utility since you can only trigger it three times a turn, but thats plenty, assuming you can reliably trigger it all three times
The Second Generation of Phyrexian Praetors (DMU, NEO, SNC, ONE) Urabrask, Heretic Praetor Jin-Gitaxias, Progress Tyrant Elesh Norn, Mother of Machines Vorinclex, Monstrous Raider Sheoldred, the Apocalypse The Phyrexian praetors have a good ability for you and deny a good ability from your opponent in a mirrored way (e.g.: buff your creatures, shrink theirs, double your counters, halve their counters)
Full of beefy characters and direct damage actions, Steel is one of the most straightforward ink colors to understand
The next slot has serialized Realms and Relics (30 cards, 0.2% overall), the regular surge foil Realms and Relics (30 cards, 12.6% overall), Surge Foil Uncommons (10 cards, 50% overall), Rares (5 rares, 11.7% overall), Mythic Rare (6 cards, 2.5%)
But it works just as well in a deck focused on the amass mechanic that generates armies
After thats said and done, it replaces the creatures you sacrificed with pests at your end step, so the payoff is pretty much immediate for both abilities