Spellweaver Helix 
Artifact
$2.62 #11125 0.35 22.9 years
Imprint — When this artifact enters, you may exile two target sorcery cards from a single graveyard.
Whenever a player casts a card, if it has the same name as one of the cards exiled with this artifact, you may copy the other. If you do, you may cast the copy without paying its mana cost.
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Cards similar to Spellweaver Helix expected a card that isn't here?
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.
Spelltwine81%
$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."
Wizard's Spellbook78%
$0.36↓#90170.68↑5.1 years↓
"
: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery."
: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery."+1 more matching line
Griffnaut Tracker77%
$0.05↓#27222↓0.00↓2.6 years↓
"When this creature enters, exile up to two target cards from a single graveyard."
Mourner's Shield76%
$0.15↓#27079↓0.3922.9 years
"When this artifact enters, you may exile target card from a graveyard."
Pit of Offerings76%
$0.38↓#3472↑0.11↓2.8 years↓
"When this land enters, exile up to three target cards from graveyards."
Mysterious Stranger76%
$0.31↓#91930.55↑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."
Panoptic Mirror76%
$25.49↑#101901.16↑22.6 years
"At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost."
Wildfire Devils76%
$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."
Arashin Sunshield74%
$0.11↓#21537↓0.13↓1.4 years↓
"When this creature enters, exile up to two target cards from a single graveyard."
Mnemonic Deluge74%
$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."
Ambush Wolf74%
$0.22↓#15972↓0.13↓1.8 years↓
"When this creature enters, exile up to one target card from a graveyard."
Soul-Guide Gryff73%
$0.07↓#26850↓0.00↓4.9 years↓
"When this creature enters, exile up to one target card from a graveyard."
Flawless Forgery73%
$0.29↓#17455↓0.56↑4.4 years↓
"Exile target instant or sorcery card from an opponent's graveyard. Copy that card. You may cast the copy without paying its mana cost."
Disposal Mummy72%
$0.04↓#27904↓0.279.1 years↓
"When this creature enters, exile target card from an opponent's graveyard."
Mizzix's Mastery72%
$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."
Arcane Bombardment72%
$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."
Scavenging Harpy71%
$0.15↓#29957↓0.326.6 years↓
"When this creature enters, exile target card from an opponent's graveyard."
Psionic Ritual71%
$0.36↓#100750.444.2 years↓
"Exile target instant or sorcery card from a graveyard and copy it. You may cast the copy without paying its mana cost."
Scarab Feast70%
$0.14↓#20061↓0.24↓9.4 years↓
"Exile up to three target cards from a single graveyard."
Rapid Decay70%
$0.43↓#28321↓0.65↑27.2 years↑
"Exile up to three target cards from a single graveyard."