@vnayin If you don't have the mox, your serenity/flux doesn't matter because you'll have died before serenity goes off or before casting the flux. Those are not really reliable solutions. Kataki hasn't been good since ballista came out. For deluge, you need the mox.
I'm not saying shops shouldn't have a T2 kill. Almost every deck has one outside of jeskai tokens. The problem is that shops' Inspector T2 kill happens much more frequently than any other deck's T2 kill because it requires less restricted cards to power out. Every other decks T2 kill requires either more restricted cards or variance to go highly in their favor.
T1 blightsteel, T2 win(multiple restricted cards, can't have blightsteel in hand)
T1/T2 vault/key wins(multiple restricted cards needed)
T2 dredge win(double bazaar opener, perfect graveyard mix from dredging)
T1/T2 outcome/storm win(needs multiple restricted cards in hand + the perfect draws)
All of these above require a much higher level of variance to occur thus making them extremely uncommon when compared to shops t2 kill.