At the LGS I've been playing at for the past few years, one of the store owners plays a very strong Marath deck
Life Gain: In multiplayer, your life total is a resource
How does Winota stack up against Najeela, the Blade Blossom
A tax deck's strategy is to slow the game down by making spells cost more, and otherwise make actions in a game as inefficient as possible
Octavia, Living Thesis will finish the game with unblockable creatures that hit hard as 8/8 beaters
Apart from the new partner commanders and the four-color face card, you get two Esper commanders, a Boros commander, a UW Commander, and two mono-red commanders, all of which deal (at least, to some extent) with the artifact theme of the deck