The Balrog, Durin's Bane
Opponent had 4 mana available 3 basic lands and one mana rock. Without sacrificing any permanents opponent was able to cast The Balrog, Durin's Bane for 4 mana and not the full 7 required.
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sethloco1988#55306
shared this idea
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volberg#10096 commented
Balrog also counts permanents sacrificed by you. So if you sacrificed something it also makes it cheaper.
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[Deleted User] commented
Did they use Treasures?