Use low-cost characters to trade efficiently, aka take out a high-cost opposing character with your low-cost one
Captain America has a mechanic around a Shield counter, which provides hexproof and extra protection from enemy spells
Tevesh Szat, Doom of Fools has the partner keyword, so dont worry about it being mono-colored
Kogla, the Titan Ape is a great example of removal for multiple permanents in green: he can fight a creature when he arrives, and remove an artifact or enchantment when he turns sideways
Meanwhile, a Blastoise stands on the other side of Charizard's fiery-breath weapon, keeping the rivalry alive even without seeing trainers like Blue or Red giving out commands
When Junji dies it either forces each opponent to lose two life and discard two cards or resurrects a non-dragon creature from your graveyard at the cost of two life