Lets look at EDHRECs top played cards alongside one of the most basic of extra turn spells - Time WarpTime Warp
Abilities like double strike, unblockable, and toxic are all relevant, and power buffs can also help you aim for that commander damage win condition
Mickey Mouse, Brave Little Tailor packs five strength and five willpower
Its strong against removal, too
The plane cards within the Commander decks change the trigger paradigm a bit, switching from the terminology of "Whenever you roll [CHAOS] to "whenever chaos ensues." The planar die roll hasnt changed, but now plane abilities can be triggered without the planar die
In one way or another, these all qualify as among the very best cards in Rise of the Floodborn