Sword of Once and Future 
Artifact — Equipment
$4.77 #4838 0.52 3.4 years
Equipped creature gets +2/+2 and has protection from blue and from black.
Whenever equipped creature deals combat damage to a player, surveil 2. Then you may cast an instant or sorcery spell with mana value 2 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.
Equip 
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Cards similar to Sword of Once and Future 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.
Efreet Flamepainter84%
$0.33↓#15409↓0.13↓5.4 years↑
"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."
Daring Waverider84%
$0.24↓#8881↓0.38↓2.1 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Goblin Dark-Dwellers83%
$0.26↓#8945↓0.00↓10.6 years↑
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Seifer Almasy82%
$0.29↓#10537↓0.18↓1.2 years↓
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Mission Briefing80%
$0.31↓#49350.07↓7.9 years↑
"Surveil 2, then choose an instant or sorcery card in your graveyard. You may cast it this turn. If that spell would be put into your graveyard, exile it instead."
Diviner of Mist78%
$0.28↓#8659↓0.21↓1.4 years↓
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Sword of Body and Mind78%
$18.24↑#43140.6116.0 years↑
"Equipped creature gets +2/+2 and has protection from green and from blue."
+1 more matching line
Sword of Sinew and Steel77%
$3.30↓#41920.86↑7.2 years↑
"Equipped creature gets +2/+2 and has protection from black and from red."
+1 more matching line
Sword of Light and Shadow76%
$8.34↑#2234↑0.4622.6 years↑
"Equipped creature gets +2/+2 and has protection from white and from black."
+1 more matching line
Sword of Fire and Ice76%
$21.23↑#1337↑0.76↑22.6 years↑
"Equipped creature gets +2/+2 and has protection from red and from blue."
+1 more matching line
Obsidian Acolyte76%
$0.38↓#27919↓0.05↓25.9 years↑
"
: Target creature gains protection from black until end of turn."
: Target creature gains protection from black until end of turn."
Sword of Truth and Justice76%
$30.82↑#1684↑0.65↑7.2 years↑
"Equipped creature gets +2/+2 and has protection from white and from blue."
+1 more matching line
Glowcap Lantern74%
$0.24↓#11320↓0.00↓2.8 years
"Equip "
"
Runechanter's Pike74%
$0.32↓#9849↓0.31↓14.9 years↑
"Equip "
"
Sword of Feast and Famine72%
$36.64↑#542↑1.06↑15.6 years↑
"Equipped creature gets +2/+2 and has protection from black and from green."
+1 more matching line
Sanctuary Blade72%
$0.38↓#14409↓0.436.4 years↑
"Equipped creature gets +2/+0 and has protection from the last chosen color."
+1 more matching line
Strength of Isolation72%
$0.25↓#26624↓0.00↓24.6 years↑
"Enchanted creature gets +1/+2 and has protection from black."
Kess, Dissident Mage72%
$3.80↓#3135↑0.559.0 years↑
"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."
Mavinda, Students' Advocate72%
$0.52↓#10308↓0.505.4 years↑
"
: You may cast target instant or sorcery card from your graveyard this turn. If that spell doesn't target a creature you control, it costs 
more to cast this way. If that spell would be put into your graveyard, exile it instead. Activate only once each turn."
: You may cast target instant or sorcery card from your graveyard this turn. If that spell doesn't target a creature you control, it costs more to cast this way. If that spell would be put into your graveyard, exile it instead. Activate only once each turn."
Victor Timely, Wily Tycoon71%
$0.26↓#27392↓0.00↓0.2 years↓
"When this card enters, you may cast target artifact, instant, or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."