The Balrog, Durin's Bane

This spell costs {1} less to cast for each permanent sacrificed this turn.
Haste
The Balrog can't be blocked except by legendary creatures.
When The Balrog dies, destroy target artifact or creature an opponent controls.

The Lord of the Rings: Tales of Middle-earth

Tales of Middle-earth Promos

This spell costs {1} less to cast for each permanent sacrificed this turn.
Haste
The Balrog, Durin's Bane can't be blocked except by legendary creatures.
When The Balrog dies, destroy target artifact or creature an opponent controls.

The Balrog, Durin's Bane's first ability can't reduce its cost to less than {B}{R}.

The Balrog, Durin's Bane's first ability counts every permanent that was sacrificed this turn, by any player.