I dont know how this will affect Standard (it probably wont) but itll likely see a lot of play in Pioneer, a format that already heavily supports mono-green creature decks
This is also pretty much the only monarch card that can retrigger without a flicker effect or something
Her static ability helps protect your planeswalkers, and her ability to churn out tokens that let you loot is surprisingly powerful
I'd likely prioritise good two-drops or removal like Epic Confrontation over this
However, if you do, and all of those targets are illegal as the ability tries to resolve, it won't resolve and none of its effects will happen
All these options are great in different scenarios, whether youre looking to survive a board wipe, push some damage through, or swing out with an alpha strike