To get the most out of it, you want to build on good nonlegendary creatures that are worth copying, then capitalize on myriad which is an inherently strong ability
Rootha, Mastering the Moment Rootha, Mastering the Moment is an easy one to get behind because hasty evasive tokens can be a win condition on their own
That said, if a curative item made from the body of a monster appears in a treasure chest left by a dead animal, you can use that immediately (if you have the Item ability and learned how to apply the corresponding potion)
Once it is in play, your legendary creatures become Birds of Paradise with Vigilance tacked on, allowing you to attack before tapping them to make mana of any color during your second main phase
We might even have to do an article featuring the best Dogs in Magic in the near future
Over the last years especially the Moxen, Ancestral Recall and Time Walk went up in price quite significantly