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I see only 3 moments you want to activate the effect

I especially like how much control you have over when this transforms because it only triggers off spells that cost 4 or more, or you can put counters on the Emperor so you just need to trigger it once or twice to flip

You can only activate 1 "Stairway to a Fabled Realm" per turn

.not great

You basically just need a card or two to turn this into something obnoxious

You can destroy this field spell alongside every plant monster on the field to revive a plant monster from your graveyard, providing that the revived monster has attack equal to the combined attack of all the monsters you just destroyed