The Commander bracket system explicitly bans chaining together extra turns until bracket 4, and at that power level a slightly durdly card like Sage of Hours - which requires a good deal of set up to get going - just might not be good enough
Both cost two mana and are relatively innocuous creatures by themselves
Control players in particular might find the idea of casting an instant-speed Faithless Looting abhorrent, as its card disadvantage without graveyard synergies
Crashing Footfalls, Elementals, and Bring to Light Scapeshift all have few turn one plays, so they can stand to fetch a Triome on turn one and start setting up their mana
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As to the new cards, by far the best addition is Mightform Harmonizer, which turns any of our creatures into Tifa Lockhart