Dragon Tempest 
Enchantment
$2.54 #848 0.53 11.4 years
Whenever a creature you control with flying enters, it gains haste until end of turn.
Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control.
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Cards similar to Dragon Tempest expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Scourge of Valkas95%
$3.43↑#1527↓0.4513.1 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."
Invasion of Tarkir // Defiant Thundermaw84%
$2.41↓#8084↓0.443.4 years↓
"Whenever a Dragon you control attacks, it deals 2 damage to any target."
Wrathful Red Dragon82%
$6.44↑#2260↓0.444.2 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Sarkhan's Rage81%
$0.06↓#24862↓0.06↓11.4 years
"this card deals 5 damage to any target. If you control no Dragons, this card deals 2 damage to you."
Warstorm Surge78%
$0.76↓#7140.4515.1 years↑
"Whenever a creature you control enters, it deals damage equal to its power to any target."
Waterkin Shaman76%
$0.10↓#30696↓0.537.2 years↓
"Whenever a creature you control with flying enters, this creature gets +1/+1 until end of turn."
Lozhan, Dragons' Legacy76%
$0.29↓#4244↓0.18↓4.2 years↓
"Whenever you cast an Adventure or Dragon spell, this card deals damage equal to that spell's mana value to any target that isn't a commander."
Vigilante Justice76%
$0.06↓#17195↓0.09↓14.3 years↑
"Whenever a Human you control enters, this enchantment deals 1 damage to any target."
In the Web of War75%
$0.40↓#18880↓0.80↑21.6 years↑
"Whenever a creature you control enters, it gets +2/+0 and gains haste until end of turn."
Ogre Battledriver74%
$0.30↓#3287↓0.22↓13.7 years↑
"Whenever another creature you control enters, that creature gets +2/+0 and gains haste until end of turn."
Electropotence74%
$0.40↓#21447↓0.21↓16.9 years↑
"Whenever a creature you control enters, you may pay 
. If you do, that creature deals damage equal to its power to any target."
. If you do, that creature deals damage equal to its power to any target."
Hawkeye, Trick Shot74%
$3.37↑#15619↓0.00↓0.2 years↓
"Whenever this card or another Hero you control enters, it deals damage equal to the number of Heroes you control to any target."
Terror of the Peaks72%
$21.41↑#518↑1.17↑6.2 years↓
"Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target."
Thunderbreak Regent72%
$0.31↓#3022↓0.24↓11.4 years
"Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, this creature deals 3 damage to that player."
Watcher of the Spheres72%
$0.50↓#4402↓0.03↓6.2 years↓
"Whenever another creature you control with flying enters, this creature gets +1/+1 until end of turn."
Spit Flame71%
$0.21↓#4679↓0.15↓8.1 years↓
"Whenever a Dragon you control enters, you may pay . If you do, return this card from your graveyard to your hand."
. If you do, return this card from your graveyard to your hand."
Draconic Roar70%
$0.14↓#19452↓0.13↓11.4 years
"this card deals 3 damage to target creature. If you revealed a Dragon card or controlled a Dragon as you cast this spell, this card deals 3 damage to that creature's controller."
Trial of Zeal70%
$0.09↓#28796↓0.539.4 years↓
"When this enchantment enters, it deals 3 damage to any target."
Overlord of the Boilerbilges70%
$1.74↓#4515↓0.21↓1.9 years↓
"Whenever this permanent enters or attacks, it deals 4 damage to any target."
Outpost Siege70%
$0.25↓#2361↓0.13↓11.6 years
"• Dragons — Whenever a creature you control leaves the battlefield, this enchantment deals 1 damage to any target."