Rod of Absorption {2}{U}
Artifact
Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves.
{X}, {T}, Sacrifice this artifact: You may cast any number of spells from among cards exiled with this artifact with total mana value X or less without paying their mana costs.
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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.
River Song's Diary 97%
$0.41#5986
"Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves."
Eye of the Storm 93%
$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."
Dryad Militant 88%
$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 87%
$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."
Kess, Dissident Mage 85%
$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."
Lilah, Undefeated Slickshot 84%
$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."
Sailors' Bane 83%
$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."
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."
Power Pack 82%
#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."
Hive Mind 82%
$9.85#7651
"Whenever a player casts an instant or sorcery spell, each other player copies that spell. Each of those players may choose new targets for their copy."
Goliath Daydreamer 81%
$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."
Suffocation 81%
$0.15#31137
"Cast this spell only if you were dealt damage this turn by a red instant or sorcery spell."
Pyxis of Pandemonium 81%
$0.28#11680
"{7}, {T}, Sacrifice this artifact: Each player turns face up all cards they own exiled with this artifact, then puts all permanent cards among them onto the battlefield."
Moonsilver Key 80%
$0.93#1629
"{1}, {T}, Sacrifice this artifact: Search your library for an artifact card with a mana ability or a basic land card, reveal it, put it into your hand, then shuffle."
Efreet Flamepainter 80%
$0.24#15040
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."