Glorious Purpose 

Enchantment — Plan
Whenever a creature you control connives, put a +1/+1 counter on that creature and a plan counter on this enchantment.
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.
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Cards that do something similar expected a card that isn't here?
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Doom Reigns Supreme 94%
$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."
Construct a Cosmic Cube 91%
$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."
Claim the Kingdom 84%
$0.28#16957
"When the fourth plan counter is put on this enchantment, sacrifice it. When you do, put an indestructible counter on target creature you control."