This would be good even if it could never transform, and transforming it is actually very doable, since it spits out Wizard tokens and is a Wizard itself
In response, Wizards of the Coast consolidated the best of both worlds, starting with Murders at Karlov Manor
Craterhoof Behemoth It just has to be Craterhoof Behemoth, the walk off home run in card form that has ended so many untold games of Magic
Turntimber Symbiosis / Turntimber, Serpentine Wood Turntimber Symbiosis is an archetypical big green sorcery
You wouldnt think a 4-drop with no ETB, card advantage ability, or death trigger would be all that much of a problem, and yet, Sheoldred has made their presence known across just about every format, even Vintage