Notice that indestructible is not the same as effects that prevent all damage: With indestructible, the damage is still being dealt (and thus abilities that care about dealt damage will still trigger)
These sets don't stay in stock long, so getting them at retail is always a win
You can then play the non-Adventure portion of the card from exile
While Snow Mercy only gives those creatures counters, you can use Snow Mercy to tab down those creatures, and the fun part here comes with how you activated that ability because you have to tap, then untap, then tap, then untap, then tap Snow Mercy
Additionally, if Izzet Storm ever becomes popular again, you can sideboard one copy of Mindbreak Trap too