Delvefall
Caustic Exhale

Caustic Exhale {B}

Instant

As an additional cost to cast this spell, behold a Dragon or pay {1}. (To behold a Dragon, choose a Dragon you control or reveal a Dragon card from your hand.)
Target creature gets -3/-3 until end of turn.

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extra filters

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the card's type line must contain this. the filter box takes any word, not just the list: t:legendary, t:aura, or -t:creature to exclude one

only legendary creatures, the cards that can lead a commander deck

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

Dracogenesis
Dracogenesis 84%
$12.84#2400
"You may cast Dragon spells without paying their mana costs."
Dispelling Exhale
Dispelling Exhale 83%
$0.19#9129
"As an additional cost to cast this spell, you may behold a Dragon."
Osseous Exhale
Osseous Exhale 83%
$0.06#16990
"As an additional cost to cast this spell, you may behold a Dragon."
Piercing Exhale
Piercing Exhale 83%
$0.15#14005
"As an additional cost to cast this spell, you may behold a Dragon."
Collective Nightmare
Collective Nightmare 100%
$0.15#23094
"Target creature gets -3/-3 until end of turn."
Wither and Bloom
Wither and Bloom 100%
$0.14#15677
"Target creature gets -3/-3 until end of turn."
Last Gasp
Last Gasp 100%
$0.19#17070
"Target creature gets -3/-3 until end of turn."
Scorpion's Sting
Scorpion's Sting 100%
$0.14#14152
"Target creature gets -3/-3 until end of turn."
Ichor Slick
Ichor Slick 100%
$0.16#16889
"Target creature gets -3/-3 until end of turn."
Weigh Down
Weigh Down 100%
$0.09#27283
"Target creature gets -3/-3 until end of turn."
Strangling Spores
Strangling Spores 100%
$0.09#28647
"Target creature gets -3/-3 until end of turn."
Tragic Fall
Tragic Fall 100%
$0.05#20756
"Target creature gets -3/-3 until end of turn."
Deal Gone Bad
Deal Gone Bad 100%
$0.19#20337
"Target creature gets -3/-3 until end of turn. Target player mills three cards."
Tar Snare
Tar Snare 99%
$0.04#29616
"Target creature gets -3/-2 until end of turn."
Wring Flesh
Wring Flesh 99%
$0.07#27268
"Target creature gets -3/-1 until end of turn."
Deceive the Messenger
Deceive the Messenger 99%
$0.14#14053
"Target creature gets -3/-0 until end of turn."
Constricting Tendrils
Constricting Tendrils 99%
$0.03#28819
"Target creature gets -3/-0 until end of turn."
Dizzy Spell
Dizzy Spell 99%
$2.60#6292
"Target creature gets -3/-0 until end of turn."
Bewilder
Bewilder 99%
$0.08#26537
"Target creature gets -3/-0 until end of turn."
Dazzling Lights
Dazzling Lights 99%
$0.06#22612
"Target creature gets -3/-0 until end of turn."