May I suggest tutoring a free Omniscience directly into play when this dies
In addition to all hitting really, really hard, they eat away at everything else on the board, but that non-sacrifice ability that Jon gives them means that they will never get sacrificed to their own abilities the usual way out from under their effects
Myriad is a powerful way to ramp up from one attack to many, and that plays very well with multiplayer and Commander and Myriad Vehicle is a good way to deal with that
with her out, its not unusual to put three or six counters on each creature we control every turn
Before we begin, though, I just want to say that I might have missed a few of the notable new cards
Put the rest on the bottom of your library in a random order. Thats a lot of text, but basically: if you play a card that costs seven mana, you get to look at the top seven cards of your deck, and then cast a spell from among those cards that costs seven mana or less for free