It really seems like Wizards of the Coast is going deep to support multiplayer Commander as a format in their design of recent sets
I think my default would be combat
If you rely mainly on creatures, which is very possible to do thanks to all the great black options that have been printed in recent years, then Mai offers extra pressure at no cost to you
Magic Tricks : Jumbo cards are used for visibility during stage performances
The one-shot Heroic Intervention on the flip side is worth playing just for that, as is the end step counters for attacking creatures (which does, in fact, include the dragon you got from flipping it)
4 - Mox Opal There are five Moxes included in the Power 9 (scroll down for the full list), and while the effect of adding a single mana may seem a little tame, its a powerful ramp in the early turns