Thunderbreak Regent 
Creature — Dragon
$0.25 #3014 0.21 11.6 years
Flying
Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, this creature deals 3 damage to that player.
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Cards similar to Thunderbreak Regent expected a card that isn't here?
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Scalelord Reckoner86%
$0.89↑#6376↓0.50↑9.2 years↓
"Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, destroy target nonland permanent that player controls."
Retromancer84%
$0.17↓#31274↓0.1128.0 years↑
"Whenever this creature becomes the target of a spell or ability, this creature deals 3 damage to that spell or ability's controller."
Whirlwing Stormbrood // Dynamic Soar82%
$0.17↓#6602↓0.07↓1.5 years↓
"Flying"
Scavenger Regent // Exude Toxin80%
$0.45↑#6051↓0.281.5 years↓
"Flying"
Firespitter Whelp80%
$0.24↓#3905↓0.151.9 years↓
"Whenever you cast a noncreature or Dragon spell, this creature deals 1 damage to each opponent."
Wrathful Red Dragon75%
$9.32↑#2255↑0.48↑4.4 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Leyline of Combustion75%
$0.41↑#10910↓0.217.3 years↓
"Whenever you and/or at least one permanent you control becomes the target of a spell or ability an opponent controls, this enchantment deals 2 damage to that player."
Scourge of Valkas75%
$1.25↑#1506↑0.59↑13.3 years↑
"Whenever this creature or another Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Kargan Dragonrider74%
$0.06↓#25226↓0.00↓8.3 years↓
"As long as you control a Dragon, this creature has flying."
Dragonlord's Servant74%
$0.19↓#1346↑0.2111.6 years
"Dragon spells you cast cost 
less to cast."
less to cast."
Draconic Lore74%
$0.20↓#7945↓0.244.4 years↓
"This spell costs less to cast if you control a Dragon."
less to cast if you control a Dragon."
Dragonspeaker Shaman74%
$0.36↑#1313↑0.2923.4 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Fighting Drake73%
$0.10↓#32007↓0.00↓29.0 years↑
"Flying"
Vassal Soul73%
$0.08↓#30769↓0.00↓14.0 years↑
"Flying"
Air Elemental73%
$0.02↓#24432↓0.2733.2 years↑
"Flying"
Mahamoti Djinn73%
$0.09↓#25646↓0.00↓33.2 years↑
"Flying"
Bog Imp73%
$0.06↓#27311↓0.06↓32.2 years↑
"Flying"
Cloud Manta73%
$0.02↓#27920↓0.00↓11.0 years
"Flying"
Spotted Griffin73%
$0.17↓#29989↓0.00↓29.5 years↑
"Flying"
Territorial Roc73%
$0.02↓#28691↓0.00↓11.6 years
"Flying"