Bilbo, Thief in the Night {1}{U}
Legendary Creature — Halfling Rogue
Spells you cast from anywhere other than your hand cost {1} less to cast.
Whenever Bilbo attacks, you may cast an artifact, instant, or sorcery spell from your graveyard. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead.
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Cards that do something similar expected a card that isn't here?
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Savvy Trader 100%
$3.81#4184
"Spells you cast from anywhere other than your hand cost {1} less to cast."
Sage of the Beyond 96%
$1.06#4752
"Spells you cast from anywhere other than your hand cost {2} less to cast."
Advanced Reconstruction 96%
$0.34#10757
"Spells you cast from anywhere other than your hand cost {2} less to cast."
Fortune Teller's Talent 96%
$0.78#3752
"Spells you cast from anywhere other than your hand cost {2} less to cast."
Jeleva, Nephalia's Scourge 91%
$1.90#14126
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
The Dawning Archaic 89%
$1.22#9492
"Whenever this card attacks, 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."
Norman Osborn // Green Goblin 81%
$18.99#5662
"Spells you cast from your graveyard cost {2} less to cast."
Emet-Selch of the Third Seat 81%
$0.34#3271
"Spells you cast from your graveyard cost {2} less to cast."
Locket of Yesterdays 80%
$2.30#7553
"Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard."
The Twelfth Doctor 80%
$0.33#7210
"The first spell you cast from anywhere other than your hand each turn has demonstrate."