About the closest thing to a fair Oath of Druids deck as you can find is the G/W Archangel battlefield control deck that Randy Buehler and Team CMU took to US Nationals 1998
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And even if they do, you could enhance Gleeful Arsonist's power to have it deal more damage when those few non-creature spells do come out
I think there are a lot of interesting cards, power levels are spread well, and there are buffs to bad decks while also not pushing the good decks excessively hard
The limits are pretty much your color identity, your budget, and your creativity
As a two cost card, it's cheap, inkable, and it replaces itself by allowing you to draw a card