Hopefully one or more of these options gives you a few ideas for your own Jumbo Cactuar deck
Gix, Yawgmoth Praetor Gix, Yawgmoth Praetor is very good in black disruptive/discard decks filled with cards like tokens, Deep-Cavern Bat, or Preacher of the Schism
Amber has some incredible highlights, but it lacks the power of stronger colors, particularly in the late game
1-2 Exhibition and Core (no 2-card combos) The community has determined this isn't a true 2-card combo because the results are not significant
With this Magic: The Gathering Starter Commander Deck Draconic Destruction (Red-Green), battle opponents with powerful creatures and spells
It simply lets you play any two cards as your commander as long as both have partner