Bloodthirsty Adversary 

Creature — Vampire
$0.35 #14496 0.35 4.9 years
Haste
When this creature enters, you may pay 
any number of times. When you pay this cost one or more times, put that many +1/+1 counters on this creature, then exile up to that many target instant and/or sorcery cards with mana value 3 or less from your graveyard and copy them. You may cast any number of the copies without paying their mana costs.
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Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Arcane Proxy84%
$0.42↑#162800.363.8 years↓
"When this creature enters, if you cast it, exile target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost."
Surge to Victory80%
$0.30↓#4879↑0.24↓5.4 years
"Exile target instant or sorcery card from your graveyard. Creatures you control get +X/+0 until end of turn, where X is that card's mana value. Whenever a creature you control deals combat damage to a player this turn, copy the exiled card. You may cast the copy without paying its mana cost."
Mysterious Stranger80%
$0.31↓#9193↑0.55↑2.5 years↓
"When this creature enters, for each graveyard with an instant or sorcery card in it, exile target instant or sorcery card from that graveyard. If two or more cards are exiled this way, choose one of them at random and copy it. You may cast the copy without paying its mana cost."
Roving Actuator80%
$0.13↓#22986↓0.16↓1.1 years↓
"When this creature enters, if a nonland permanent left the battlefield this turn or a spell was warped this turn, exile up to one target instant or sorcery card with mana value 2 or less from your graveyard. Copy it. You may cast the copy without paying its mana cost."
Mizzix's Mastery78%
$4.43↑#807↑0.65↑10.8 years↑
"Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile this card."
Wildfire Devils78%
$0.25↓#6793↑0.10↓7.0 years↑
"When this creature enters and at the beginning of your upkeep, choose a player at random. That player exiles an instant or sorcery card from their graveyard. Copy that card. You may cast the copy without paying its mana cost."
Renegade Bull75%
$0.19↓#143560.00↓0.4 years↓
"Whenever this creature attacks, exile up to one target instant or sorcery card from your graveyard and copy it. You may cast the copy without paying its mana cost."
Arcane Bombardment75%
$5.66↑#2291↑0.384.4 years
"Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs."
Spelltwine74%
$0.30↓#7742↑0.20↓14.1 years↑
"Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile this card."
Mnemonic Deluge73%
$7.64↑#3766↑0.52↑5.8 years
"Exile target instant or sorcery card from a graveyard. Copy that card three times. You may cast the copies without paying their mana costs. Exile this card."
Storm of Memories73%
$0.44↑#139570.00↓0.8 years↓
"Exile an instant or sorcery card with mana value 3 or less from your graveyard at random. You may cast it without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Founding the Third Path72%
$0.21↓#139050.384.0 years
"Exile target instant or sorcery card from your graveyard. Copy it. You may cast the copy."