What Permafrost Do?
When you cast Permafrost on a unit, that unit becomes stunned, meaning that it's unable to attack or block - although it's still able to use special abilities. Unlike a normal stun, this status is a curse and does not wear off after a turn, hence the card's name.
At first glance it seems that Permafrost is pretty much a cheap and easy unit kill spell, just without the removal. In fact it's not quite that powerful.
Counters To Permafrost
What confuses a lot of people is that there's no card in Eternal that says 'remove a curse'. Curse are considered attachments, so to 'uncurse' a unit you need to remove or disable the attachment.
The best way to do this is with a card such as Decay or Furnace Mage which can be used on your own units as well as those of your opponent. Unfortunately some cards such as Ruin specify an enemy attachment so these won't work.
Those methods work to counter any curse. Specific to Permafrost is the idea of giving the unit the Endurance ability. Since units with Endurance can't be stunned, this effectively negates the Permafrost effect. The easiest and best way to do this is by playing the relic attachment Infinite Hourglass on yourself.
With the availability of these counters, Permafrost remains a powerful spell for countering an immediate threat, but it doesn't completely remove a unit from play.
This page written for Eternal version 1.17, Card Set 1
Last updated: 9-07-2017