Ancient Apparition or AA is a Support Hero who is good early game due to his slows and disables, and can use his Ult Mid to Late Game alot to assist his team from any point on the map.

Cold Feet is best used in combonation with a Stun or Eul's Scepter, some type of disable that can hold an enemy in place for a few seconds to allow Cold feet to freeze them solid allowing for an easy kill.

Ice Vortex has a very long range and is used to slow enemies. It also Increases Magic damage done to anyone in the AoE. It has a short Cooldown of 5 Seconds so try to use it in team fights to slow and damage enemies.

Chilling Touch adds Magic Damage to friendly heroes in a Wide AoE. This is a good Spell to push lanes as it can kill creeps fast and add some extra damage in team fights. Just keep in mind it will reduce Attack speed by 15% so choose wisely who you cast it on

Ice Blast is a very effective Global Ult, it allows AA to help his team in team fights, push lanes globally and finish off fleeing enemies. Remember Ice Blast will stop all health Regen, so feel free to fire a shot at the Enemy Fountain is needed. This Spell is Highly effective on Heroes who Depend on Lifesteal to Survive in Teamfights.