Removal Ive got a lot of the removal spells youd expect in a Selesnya deck, though I still dont see enough people playing Contraband Livestock, which is the most fun you can have removing a creature from the game
Impostor Syndrome There was a time when big splashy enchantments like this were exactly what Commander was all about, but the formats a lot more streamlined these days for something like Impostor Syndrome to really take off
You may just have a small fortune on your hands
Doing it in your opponents end step makes it active in your turn, so you can still operate, even with a little mana available
You start with 20 life and the first 19 of those have no impact on the game as such and so you have an abundant pile of resources at your disposal
Your creatures will be faster, stronger, and more burdensome for your opponent if you can create ways to get to 5 mana quickly