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A commander like Carth the Lion can help churn out planeswalker after planeswalker to build a league of superfriends who work together

After that I would mix fetchlands with duals / triomes, the usual stuff

That might not sound like much, but remember that some of the best MTG cards ever cost one or less mana

The manabase as presented is also right in the middle as far as budget is concerned

Avengers Assemble (Red-White-Blue) Wakanda Forever (Green-White) The Fantastic Four (Red-Green-White-Blue) Doom Prevails (Blue-Black-Red) Bring Super Heroes (or their foes) to your next Commander game with Magic: The Gathering | Marvel Super Heroes Commander decks

That's a hard decision to make and will definitely leave your opponent thinking while you twiddle your thumbs in anticipation