A lot of hero abilities are mimicked in spells. Most closely related to this would be Zaladar and Lightning Strike.

Comet
Mage Ability
4cc
Target opposing hero or ally takes 3 ice damage. Allie is frozen for 2 turns.

Aternatives

3cc
2 damage, 1 turn

4cc
4 damage, 1 turn

4cc
4 damage, 2 turns (making it the same as Eledwen)