I would recommend
Flamewake Phoenix over
Temur Sabertooth to have another 3 drop on curve. That guy is still cheap and a beast... recurring 2/2 flier with Haste.
I tried Icy Blasts initially, and they just don't get the work in main board. They are great sideboard against heavy creature threats. I would mainboard
Stubborn Denial in their place. This card has done wonders in my Temur deck. It doesn't handle creatures, but there's lots of red spells to take care of those. One blue open to shutdown Board wipes is phenomenal. Good luck.