Elbrus, the Binding Blade // Withengar Unbound

Equipped creature gets +1/+0. When equipped creature deals combat damage to a player, unattach Elbrus, then transform it. Equip {1} --- 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.