mtg arcades commander deck the Strategist M19] Arcades, the Strategist :

Mageta the Lion (S, Block) While Blinding Angel might have heralded the return of white-blue control decks, Mageta the Lion pushed them over the top

Card advantage matters

Some sub-themes include: the synergy between Huey, Dewey, and Louie, Donald Duck's nephews from Ducktales

While none of the competitive success has to do with it being a dinosaur, you could undoubtedly satisfy the companion requirement with a dino build since they have a naturally high mana value for the most part

Hitting the five different mana values is easier than it might seem in a singleton format as long as you build your deck with a functional curve