Thunderbreak Regent 
Creature — Dragon
$0.31 #3022 0.24 11.4 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%
$0.83↑#6242↓0.249.0 years↓
"Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, destroy target nonland permanent that player controls."
Kilnmouth Dragon86%
$0.73↑#17391↓0.2723.6 years↑
"Flying"
Retromancer84%
$0.15↓#30992↓0.00↓27.9 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%
$0.16↓#6616↓0.09↓1.4 years↓
"Flying"
Firespitter Whelp80%
$0.24↓#4044↓0.191.8 years↓
"Whenever you cast a noncreature or Dragon spell, this creature deals 1 damage to each opponent."
Stenchskipper76%
$0.31#29298↓0.1818.6 years↑
"Flying"
Wrathful Red Dragon75%
$6.44↑#2260↑0.44↑4.2 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%
$0.59↑#10587↓0.287.2 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%
$3.43↑#1527↑0.45↑13.1 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."
+1 more matching line
Aeronaut Cavalry74%
$0.07↓#24767↓0.00↓3.8 years↓
"Flying"
Dragonlord's Servant74%
$0.28↓#1344↑0.2211.4 years
"Dragon spells you cast cost 
less to cast."
less to cast."
Draconic Lore74%
$0.19↓#7822↓0.03↓4.2 years↓
"This spell costs less to cast if you control a Dragon."
less to cast if you control a Dragon."
Dragonspeaker Shaman74%
$1.98↑#1312↑0.2623.3 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Kargan Dragonrider74%
$0.07↓#25055↓0.228.1 years↓
"As long as you control a Dragon, this creature has flying."
Kelinore Bat74%
$0.09↓#28728↓0.00↓17.1 years↑
"Flying"
Living Tempest74%
$0.08↓#29974↓0.43↑5.9 years↓
"Flying"
Scion of Ugin74%
$0.10↓#23935↓0.40↑11.4 years
"Flying"
Millennial Gargoyle74%
$0.09↓#29272↓0.00↓13.6 years↑
"Flying"
Enforcer Griffin74%
$0.07↓#27521↓0.00↓7.3 years↓
"Flying"
Colorful Feiyi Sparrow74%
$0.24↓#27825↓0.278.2 years↓
"Flying"