ACR may have flooded their ranks, including some interesting, if not entirely synergistic options, but your best bet is to stock up on combat damage payoffs, no matter which commander you run
[Psychic] Fade Out 20 Return this Pokemon and all cards attached to it to your hand
Which makes sense when you look at its other printings: the cheapest version from Baldur's Gate is worth close to $100, for a card that is one of Magic's best dragons, an amazing treasure card, and a cEDH staple
By linking your system to someone else's, once per person, and doing "Card Pop!", each of you gets one random card
you can have as many of those as you need in your deck
(Color indicator: Ragnarok, Divine Deliverance is black and green) Vigilance, menace, trample, reach, haste When Ragnarok dies, destroy target permanent and return target nonlegendary permanent card from your graveyard to the battlefield