The instant speed Return will only work on non-Humans but it can pump them as a combat trick to save them or to kill out of nowhere
This is a much spicier way to spend two mana than Counterspell, and at most tables, letting them resolve the spell later is fine
Creatures like Invisible Stalker and Geist of Saint Traft with hexproof and evasion can be powerful threats
That being said, however, thanks to the litany of weak creatures, its nevertheless reason alone to include them
This includes the new five-color Aang we saw back in June, as well as any other new Allies that arrive with the set
Hearthhull, the Worldseed, for instance, can still pull his weight in this format when given stronger support