Preserve
Preserve is an uncommon Stygian Guard spell in Monster Train 2 costing 0 Ember. It joins the Stygian Guard pool at clan level 3.
Apply Freeze to a card in your hand.
“Many precious artifacts of Hell were frozen when the Pyre was destroyed. Thankfully, this did not diminish their power, but only rendered their energy dormant until I am able to release them from their icy prison.”