Elbrus, the Binding Blade // Withengar Unbound
Dark Ascension — mythic
Legendary Artifact — Equipment // Legendary Creature — Demon
Equipped creature gets +1/+0.
When equipped creature deals combat damage to a player, unattach Elbrus, the Binding Blade, then transform it.
Equip
Withengar Unbound
Flying, intimidate, trample (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Whenever a player loses the game, put thirteen +1/+1 counters on Withengar Unbound.
Those who grasp its hilt soon hear the demon's call.