Tips!!
1. Mulligan for card draw usually. If it's a Druid keep fireball. If paladin/hunter/warlock keep frostbolts.
2. Save acolyte for turn 5 ping value vs control
3. If vsing control warrior consider conceding but if not try to get maximum value from antonidus
4. If vsing Mage play doomsayers into mirror entity
5. Experiment with deck lists. Cards like pyroblast can be removed for explosive sheep. Same with loot hoarders/cone of cold/healbot/malygos
And of course practice makes perfect

~currently legend playing exclusively cw/freeze mage