Exiling graveyards has always, and probably will always be useful in Modern (looking at you, Lurrus), and then once youve done all that you still get a 3/3 with upside for your troubles
Thankfully this is hardly the end of the world for a blue deck
This helps make your characters much less likely to be taken out in challenges, or to be banished by songs and actions that deal damage
Having Sakashima of a Thousand Faces enter as a copy of your other commander also makes it so that if your coin flips are good enough, you can have a copy of the spell resolve while you also have the original spell return to your hand when each of your commanders get different coin flip results
The chosen effect is applied
As another example, if at the start of turn six you have five cards in your inkwell and hold a two-drop, a three-drop, and a five-drop, then just cast your five-drop and dont add anything else to the inkwell at this point