Krark, the Thumbless {1}{R}
Legendary Creature — Goblin Wizard
Whenever you cast an instant or sorcery spell, flip a coin. If you lose the flip, return that spell to its owner's hand. If you win the flip, copy that spell, and you may choose new targets for the copy.
Partner (You can have two commanders if both have partner.)
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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.
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."
Zaffai and the Tempests 83%
$0.24#13709
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Baral and Kari Zev 81%
$0.24#6953
"Whenever you cast your first instant or sorcery spell each turn, you may cast a spell with lesser mana value that shares a card type with it from your hand without paying its mana cost. If you don't, create First Mate Ragavan, a legendary 2/1 red Monkey Pirate creature token. It gains haste until end of turn."
Invasion of Arcavios // Invocation of the Founders 81%
$0.31#10248
"Whenever you cast an instant or sorcery spell from your hand, you may copy that spell. You may choose new targets for the copy."
Overmaster 81%
$2.99#3095
"The next instant or sorcery spell you cast this turn can't be countered."