Crimestopper Sprite 

Creature — Faerie Detective
As an additional cost to cast this spell, you may collect evidence 6. (Exile cards with total mana value 6 or greater from your graveyard.)
Flying
When this creature enters, tap target creature. If evidence was collected, put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards that do something similar expected a card that isn't here?
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Vitu-Ghazi Inspector 100%
$0.11#25696
"As an additional cost to cast this spell, you may collect evidence 6."
Extract a Confession 100%
$0.25#10245
"As an additional cost to cast this spell, you may collect evidence 6."
Behind the Mask 100%
$0.15#18552
"As an additional cost to cast this spell, you may collect evidence 6."
Deadly Cover-Up 100%
$0.37#10370
"As an additional cost to cast this spell, you may collect evidence 6."
Analyze the Pollen 99%
$0.32#7351
"As an additional cost to cast this spell, you may collect evidence 8."
Bite Down on Crime 99%
$0.06#24969
"As an additional cost to cast this spell, you may collect evidence 6. This spell costs {2} less to cast if evidence was collected."
Conspiracy Unraveler 92%
$0.30#14316
"You may collect evidence 10 rather than pay the mana cost for spells you cast."
Brightmare 90%
$0.27#12199
"When this creature enters, tap up to one target creature. You gain life equal to that creature's power."
Fear of Immobility 89%
$0.12#16829
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."