the real answer is: it depends
Tolarian Terrors Im definitely in love with Gyarados as Tolarian Terror, but full credit to the other winding sea serpents here, illustrated by VictorP_altered on Reddit
Lumra, Bellow of the Woods is a Legendary Bear with a colossal potential power equal to the number of lands on your field, which is almost always going to be high thanks to the cards ability to fetch back all lands in your graveyard to the field
And being able to toss a snack at an opponent when you take their Orcish Bowmasters on the ultimate, which you can do on the second turn, is just extra obnoxious
Baxas haunting linework gives the card an unsettling presence and makes it just as striking in a binder as it is on the battlefield
For more information, please see the most recent version of the Magic Tournament Rules at wpn.wizards.com/en/document/magic-g (2021-07-23)