Niv-Mizzet, Supreme {W}{U}{B}{R}{G}
Legendary Creature — Dragon Avatar
Flying, hexproof from monocolored
Each instant and sorcery card in your graveyard that's exactly two colors has jump-start. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.)
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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.
Lier, Disciple of the Drowned 91%
$0.43#2209
"Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Sigarda, Host of Herons 89%
$2.87#5919
"Flying, hexproof"
Belltoll Dragon 89%
$0.26#20653
"Flying, hexproof"
Past in Flames 89%
$4.21#1265
"Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Iroh, Grand Lotus 88%
$0.43#6379
"During your turn, each non-Lesson instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Return the Past 87%
$0.35#9123
"During your turn, each instant and sorcery card in your graveyard has flashback. Its flashback cost is equal to its mana cost."
The Dawning Archaic 86%
$1.22#9492
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
The Magic Mirror 86%
$3.66#4945
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Furygale Flocking 86%
$0.22#11473
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Eddymurk Crab 86%
$1.51#13043
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Cryptic Serpent 86%
$1.02#17170
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Bedlam Reveler 86%
$0.22#13672
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Tolarian Terror 86%
$0.21#10625
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Font of Magic 84%
$0.41#12045
"Instant and sorcery spells you cast cost {1} less to cast for each time you've cast a commander from the command zone this game."
Suffocation 84%
$0.15#31137
"Cast this spell only if you were dealt damage this turn by a red instant or sorcery spell."
Taigam, Ojutai Master 83%
$1.00#9267
"Whenever you cast an instant or sorcery spell from your hand, if this card attacked this turn, that spell gains rebound."
Overmaster 83%
$2.99#3095
"The next instant or sorcery spell you cast this turn can't be countered."
Vadrik, Astral Archmage 83%
$0.34#11429
"Instant and sorcery spells you cast cost {X} less to cast, where X is this card's power."
Djinn Illuminatus 82%
$0.32#17031
"Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost."
Storm, Force of Nature 82%
$8.51#7259
"Whenever this card deals combat damage to a player, the next instant or sorcery spell you cast this turn has storm."