Manriki-Gusari is a real honorable mention here, since this was an equipment from Saviors of Kamigawa that was exclusively played to be able to destroy opposing Jittes
Expert Interview Chris Frey
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
Legendary Creature Shapeshifter Changeling Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents
Also, reanimate our creatures could re-trigger amazing abilities like Gray Merchant of Asphodel Ramp The Reaver Cleaver is a fantastic piece of equipment that only needs one hit to let us cast the top of our curve many turns earlier
He can also manipulate the life force of his enemies, draining their energy and using it to fuel his own power