Vault 112: Sadistic Simulation {2}{U}{R}
Enchantment — Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Tap up to one target creature and put a stun counter on it. You get {E}{E} (two energy counters).
III — Pay any amount of {E}. If you paid one or more {E} this way, shuffle your library, then exile that many cards from the top. You may play one of those cards without paying its mana cost.
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Cards that do something similar expected a card that isn't here?
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Origin of Captain America 100%
$0.71#27868
"Tap up to one target creature and put a stun counter on it."
Petrifying Meddler 88%
$0.13#19522
"When you cast this spell, tap up to one target creature and put a stun counter on it."
Localized Destruction 86%
$0.41#7702
"You get {E} , then you may pay one or more {E}. If you do, each creature you control with power equal to the amount of {E} paid this way gains indestructible until end of turn."