We'll answer all this and more by looking at the current prices on all top marketplaces: TCGPlayer, Cardmarket, and Ebay
Okay, maybe not anything
On top of that, you are going to run into situations where Calling in Favors is a dead draw, such as when you haven't got an ally out yet, or when you already have your best allies out and don't want to replace them
This gives you free reign to do whatever you like on your turn, with the only things you need to worry about being an instant-speed Planeswalker ability (like Teferi, Master of Time) or a land's ability (like a channelled Eiganjo, Seat of the Empire)
The top of the list is mostly Commander-focused, but youll see a smattering of potential Modern plays after Modern Horizons 3 along the way
Plus, its almost free to add to a deck that requires key threats to be protected from spot removal, so your commander gets harder to kill if you have a few untapped creatures laying around