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
There are lots of different routes you can take, but one of the simplest is Pitiless Plunderer + Gravecrawler
This card is the foundation of a GW go-wide ally strategy in Standard, and its also sees play in Commander when allies are involved
If they're locked behind the mastery pass, you'll need to unlock enough mastery orbs to unlock each one, and it will likely only be possible to unlock enough if you buy the premium mastery pass
(2025-06-06) To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Water Crystal's first ability)