Jostian, the Rime King

When Jostian enters the battlefield, search your library for a snow permanent or equipment card, reveal it, and put it into your hand.
You may pay {s} instead of the equip costs of artifacts you control.
When Jostian attacks, for each equipment
attached to Jostian, tap up to one target nonland permanent. Those permanents get a stun counter
for each nonland snow permanent you control.
Upon his coronation, the snows returned!