Myr Battlesphere 
Artifact Creature — Myr Construct
$0.24 #915 0.28 15.9 years
When this creature enters, create four 1/1 colorless Myr artifact creature tokens.
Whenever this creature attacks, you may tap X untapped Myr you control. If you do, this creature gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.
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Cards similar to Myr Battlesphere 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.
Mechanized Ninja Cavalry78%
$0.15↓#21517↓0.00↓0.5 years↓
"When this creature enters, create a 1/1 colorless Robot artifact creature token."
Oltec Cloud Guard76%
$0.06↓#23638↓0.252.8 years↓
"When this creature enters, create a 1/1 colorless Gnome artifact creature token."
Head of the Homestead75%
$0.16↓#10953↓0.00↓2.1 years↓
"When this creature enters, create two 1/1 white Rabbit creature tokens."
Beetleback Chief75%
$0.22↓#3576↓0.16↓14.3 years↓
"When this creature enters, create two 1/1 red Goblin creature tokens."
Howling Giant75%
$0.23↓#24012↓0.11↓7.2 years↓
"When this creature enters, create two 2/2 green Wolf creature tokens."
Ambassador Oak74%
$0.06↓#23771↓0.53↑18.6 years↑
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Elderleaf Mentor74%
$0.07↓#18276↓0.00↓5.6 years↓
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Prideful Parent74%
$0.12↓#10637↓0.09↓1.8 years↓
"When this creature enters, create a 1/1 white Cat creature token."
Clarion Cathars74%
$0.06↓#22951↓0.47↑4.9 years↓
"When this creature enters, create a 1/1 white Human creature token."
Watchful Giant74%
$0.02↓#29273↓0.00↓7.6 years↓
"When this creature enters, create a 1/1 white Human creature token."
Attended Knight74%
$0.09↓#18453↓0.60↑14.1 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Resolute Reinforcements74%
$0.14↓#7094↓0.00↓4.0 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Wakandan Shield Guard74%
$0.11↓#28483↓0.00↓0.2 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Goblin Instigator74%
$0.24#3248↓0.238.1 years↓
"When this creature enters, create a 1/1 red Goblin creature token."
Kyoshi Warriors74%
$0.15↓#12494↓0.00↓0.8 years↓
"When this creature enters, create a 1/1 white Ally creature token."
Invasion Reinforcements74%
$0.27↑#8336↓0.00↓0.8 years↓
"When this creature enters, create a 1/1 white Ally creature token."
Daysquad Marshal74%
$0.14↓#23670↓0.00↓6.4 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Protector of Gondor74%
$0.11↓#18424↓0.383.2 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Voice of the Provinces73%
$0.12↓#25412↓0.2714.3 years↓
"When this creature enters, create a 1/1 white Human creature token."
Yavimaya Sapherd73%
$0.26↑#17022↓0.00↓8.4 years↓
"When this creature enters, create a 1/1 green Saproling creature token."