Enchantment
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Furnace Celebration itself doesn't allow you to sacrifice any permanents. Its ability triggers whenever you sacrifice a permanent because something else instructed you to.
You choose whether to pay 
as the ability resolves, if that target is still legal. No player may take actions between the time you pay and the time damage is dealt.
You can't pay more than once each time Furnace Celebration's ability resolves.
. If you do, this enchantment deals 2 damage to any target.