Delvefall
Roving Actuator

Roving Actuator {3}{R}

Artifact Creature — Robot

Void — When this creature enters, if a nonland permanent left the battlefield this turn or a spell was warped this turn, exile up to one target instant or sorcery card with mana value 2 or less from your graveyard. Copy it. You may cast the copy without paying its mana cost.

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Cards that do something similar expected a card that isn't here?

Mysterious Stranger
Mysterious Stranger 86%
$0.38#9070
"When this creature enters, for each graveyard with an instant or sorcery card in it, exile target instant or sorcery card from that graveyard. If two or more cards are exiled this way, choose one of them at random and copy it. You may cast the copy without paying its mana cost."
Sea Gate Stormcaller
Sea Gate Stormcaller 85%
$0.35#18451
"When this creature enters, copy the next instant or sorcery spell with mana value 2 or less you cast this turn when you cast it. If this creature was kicked, copy that spell twice instead. You may choose new targets for the copies."
Daring Waverider
Daring Waverider 82%
$0.22#8434
"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-Dwellers
Goblin Dark-Dwellers 82%
$0.31#9138
"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."
Spellseeker
Spellseeker 81%
$17.44#1027
"When this creature enters, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle."
Arcane Proxy
Arcane Proxy 80%
$0.50#15986
"When this creature enters, if you cast it, exile target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost."