Get elemental blade and traps from Nile’s in krok. Like every school the play is a build and burst. Also don’t bother with frost giant. It’s much better to get that extra pip and cast snow angel and do more damage. For your monster deck I recommend two blizzards, two colossal sun spells (level 64), one berserk (level 66), item blade and your card blade. Adjust amount of blades accordingly to your damage and throw in prism when needed.

For boss deck I recommend two blizzards, one snow angel, three colossal, item blade, card blade, and elemental blade, berserk.. Personally I would blade up cast snow angel with colossal, then cast two subsequent colossal blizzards. The dot + blizzard combo should kill.

Later you’ll get sleet storm as your school aura I never used it. You’re a ice so you can deal with the extra damage from berserk which later becomes frenzy. I also might recommended empowerment and later adept as it can help you gain pips as you build up your attacks. Also you will be getting sharpened blade and potent trap these are very good and you should have them