This loop does put the creature card into the graveyard so you'll be able to make an arbitrarily large Fungus army
It will save you a support email later, and it will also prevent the classic tragedy of I printed these for a tournament (followed by the sound of your hopes collapsing into a deck box)
If, for any of the targets, you can't choose a new legal target, that target remains unchanged (even if the current target is illegal)
With a hefty 0/8 body, its also tough to remove, making it a great defensive piece in control and pillow fort decks
The ultra-rare Cosmic Foil version of The Soul Stone is already the top chase card in the Spider-Man set, and each future stone will likely receive a similar premium treatment
The Rare and Mythic Rare cards in this deck also bring extreme heat to the scene, with Elspeth, Sun's Champion creating tons of soldier tokens for you while Wildfire Awakener (a new card released just for Commander with this deck) creates tokens that ping for damage each time they're tapped
