Eyeless Watcher 
Creature — Eldrazi Drone
$0.31 #10379 0.09 11.0 years
Devoid (This card has no color.)
When this creature enters, create two 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this token: Add 
."
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Cards similar to Eyeless Watcher 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.
Brood Monitor100%
$0.12↓#94050.25↑11.0 years
"When this creature enters, create three 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this token: Add .""
.""+1 more matching line
Birthing Hulk96%
$0.11↓#16414↓0.0010.7 years
"When this creature enters, create two 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this token: Add .""
.""+1 more matching line
Scion Summoner96%
$0.09↓#15721↓0.0710.7 years
"When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add .""
.""+1 more matching line
Eldrazi Skyspawner96%
$0.10↓#12767↓0.0011.0 years
"When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add .""
.""+1 more matching line
Incubator Drone96%
$0.08↓#20888↓0.1211.0 years
"When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add .""
.""+1 more matching line
Kozilek's Predator94%
$0.10↓#108230.1216.5 years↑
"When this creature enters, create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add .""
.""
Dread Drone94%
$0.06↓#17622↓0.26↑16.5 years↑
"When this creature enters, create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add .""
.""
Emrakul's Hatcher94%
$0.24↓#7805↑0.27↑16.5 years↑
"When this creature enters, create three 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add .""
.""
Call the Scions94%
$0.13↓#13068↓0.0911.0 years
"Create two 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this token: Add .""
.""+1 more matching line
Vestige of Emrakul94%
$0.11↓#28961↓0.24↑11.0 years
"Devoid"
Eldrazi Repurposer94%
$0.22↓#95480.062.3 years↓
"Devoid"
Catacomb Sifter93%
$0.24↓#94360.0611.0 years
"When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add .""
.""+1 more matching line
Brood Butcher92%
$0.28↓#18722↓0.59↑11.0 years
"When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add .""
.""+1 more matching line
Nest Invader88%
$0.30↓#119790.0016.5 years↑
"When this creature enters, create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this token: Add .""
.""
Grave Birthing88%
$0.09↓#18501↓0.1211.0 years
"Devoid"
Drowner of Hope88%
$0.22↓#8091↑0.0011.0 years
"When this creature enters, create two 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this token: Add .""
.""+1 more matching line
Kozilek's Translator88%
$0.07↓#25954↓0.29↑10.7 years
"Devoid"
Blinding Drone88%
$0.09↓#23775↓0.19↑10.7 years
"Devoid"
Stalking Drone87%
$0.04↓#30041↓0.0010.7 years
"Devoid"
Complete Disregard87%
$0.05↓#24681↓0.33↑11.0 years
"Devoid"