mtg arcades commander deck the Strategist Replying to @Corey Brinkman318 Arcades,

Enter Path to Exile, which is a very literal description of what this white instant does

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

Card advantage matters

Kjeldoran Skycaptain is the other giant-bird rider, while the Kjeldoran Knight 's flavour text wants us to know that even the ground forces aren't discriminated against

As for Runehorn Hellkite, I've never met a Wheel of Fortune I didn't like, and even though this one is pretty expensive at six mana, it also generates random value from the graveyard if you discard it to something like Survival of the Fittest and is uncounterable and instant speed