Quest for Ancient Secrets 
Enchantment
Whenever a card is put into your graveyard from anywhere, you may put a quest counter on this enchantment.
Remove five quest counters from this enchantment and sacrifice it: Target player shuffles their graveyard into their library.
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Cards that do something similar expected a card that isn't here?
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Quest for the Nihil Stone 86%
$1.52#10315
"Whenever an opponent discards a card, you may put a quest counter on this enchantment."
Quest for Pure Flame 85%
$0.90#10194
"Remove four quest counters from this enchantment and sacrifice it: If any source you control would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead."
+1 more matching line
Quest for the Holy Relic 84%
$0.23#16335
"Whenever you cast a creature spell, you may put a quest counter on this enchantment."
+1 more matching line
Firebender Ascension 83%
$0.68#2919
"Whenever a creature you control attacking causes a triggered ability of that creature to trigger, put a quest counter on this enchantment. Then if it has four or more quest counters on it, you may copy that ability. You may choose new targets for the copy."
Zektar Shrine Expedition 82%
$0.07#19018
"Remove three quest counters from this enchantment and sacrifice it: Create a 7/1 red Elemental creature token with trample and haste. Exile it at the beginning of the next end step."
Waterbender Ascension 82%
$0.81#4110
"Whenever a creature you control deals combat damage to a player, put a quest counter on this enchantment. Then if it has four or more quest counters on it, draw a card."