If some but not all of those targets become illegal, you'll do as much as possible, including creating Clue
This effect is simply not one the Arena developers want in the format, with the Flare cycle from Modern Horizons 3 and the envoke Elementals from Modern Horizons 2 all being pre-banned in the format
Whenever another Creature enters the battlefield, its controller may draw a card if that Creature's power is greater than each other Creature's power
Moratorium Stone Choosing which card to exile is a good ability to have in Commander games, but I doubt there will be a run on this card
Farid, Enterprising Salvager Farid, Enterprising Salvager turns your fallen artifacts into Scrap tokens, which you can then sacrifice to goad creatures, pump Farid, or rummage
That's okay, I said to myself when I came in this morning, I'll just have to ask Brian (Brian Tinsman that is, Saviors lead designer) about it