Death to Our Enemies 

Enchantment — Plan
Whenever you cast a noncreature spell, create a tapped Treasure token and put a plan counter on this enchantment.
When the fourth plan counter is put on this enchantment, sacrifice it. When you do, it deals 7 damage divided as you choose among one or two targets.
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Cards that do something similar expected a card that isn't here?
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Construct a Cosmic Cube 88%
$0.35#15206
"When the seventh plan counter is put on this enchantment, sacrifice it. When you do, you control target opponent during their next turn."
Doom Reigns Supreme 86%
$0.33#14186
"When the fifth plan counter is put on this enchantment, sacrifice it. When you do, target opponent exiles the top five cards of their library. You may cast up to two spells from among the exiled cards without paying their mana costs."
Glorious Purpose 83%
$0.28#14541
"When the sixth plan counter is put on this enchantment, sacrifice it. If you do, exile the top four cards of your library. You may cast any number of spells from among them without paying their mana costs. Put the rest into your hand."