The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
Yeah I agree with you for ladder. My strategy was to have all the removal in sideboard because in some match ups banish is useless but if it was necessary then it would come in post board. You can cut like 1 wasp, 1 devour and 1 magus to fit in removal without changing the deck much.
Xenan is back in style :D
I think I would put Banish in the Main, though.
It’s just one of the strongest removal spells out there.