For example, if Prowler is blocked by a creature with 4 power, and then an effect gives that creature -3/-0, it won't stop blocking Prowler
Playing the exiled cards will make you Treasure tokens, and if there are any left over by the end of the turn, you will still get mana by creating those Spawns
Of course, the dream is to hit a Carnosaur out of an Etali trigger, but at worst you can count on the former ability to kill pesky little creatures or planeswalkers by discarding it from your hand, which comes very handy when youre playing around counterspells other than Stifle
Having transform/DFCs return was the best way to represent the final bosses (when was the last time FF had a single phase final boss?) and characters who changed
It remains to be seen whether a Gruul shell can abuse this trick to the same effect as its blue cousins
We have MTG Duskmourn in the meantime, but this set is closer than you may think