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.