River Song's Diary {3}
Artifact — Book
Imprint — Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves.
At the beginning of your upkeep, if there are four or more cards exiled with this artifact, choose one of them at random. You may cast it without paying its mana cost.
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Cards that do something similar 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.
Rod of Absorption 97%
$0.49#11645
"Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves."
Eye of the Storm 92%
$1.33#11469
"Whenever a player casts an instant or sorcery card, exile it. Then that player copies each instant or sorcery card exiled with this enchantment. For each copy, the player may cast the copy without paying its mana cost."
Lilah, Undefeated Slickshot 87%
$0.28#10307
"Whenever you cast a multicolored instant or sorcery spell from your hand, exile that spell instead of putting it into your graveyard as it resolves. If you do, it becomes plotted."
Dryad Militant 87%
$0.13#18485
"If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead."
Draconic Intervention 87%
$0.28#14995
"As an additional cost to cast this spell, exile an instant or sorcery card from your graveyard."
Arcane Bombardment 86%
$7.57#2233
"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."
Goliath Daydreamer 85%
$0.30#10121
"Whenever you cast an instant or sorcery spell from your hand, exile that card with a dream counter on it instead of putting it into your graveyard as it resolves."
Kess, Dissident Mage 84%
$4.32#3076
"Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."
Gale, Waterdeep Prodigy 84%
$0.48#5161
"Whenever you cast an instant or sorcery spell from your hand, you may cast up to one target card of the other type from your graveyard. If a spell cast from your graveyard this way would be put into your graveyard, exile it instead."
Wrexial, the Risen Deep 82%
$1.87#5216
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Sailors' Bane 81%
$0.25#14237
"This spell costs {1} less to cast for each card you own in exile and in your graveyard that's an instant card, a sorcery card, or a card that has an Adventure."
Taigam, Ojutai Master 81%
$1.00#9267
"Whenever you cast an instant or sorcery spell from your hand, if this card attacked this turn, that spell gains rebound."
Power Pack 81%
#21710
"Whenever this card deals combat damage to a player, exile target instant or sorcery card from your graveyard chosen at random. At the beginning of your next upkeep, you may cast that card without paying its mana cost. If that spell would be put into your graveyard, exile it instead."