Imperiosaur 
Creature — Dinosaur
$0.10 #26304 0.24 19.3 years
Spend only mana produced by basic lands to cast this spell.
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Cards similar to Imperiosaur 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.
Myr Superion86%
$2.85↑#10362↑0.05↓15.3 years↓
"Spend only mana produced by creatures to cast this spell."
Security Rhox78%
$0.06↓#262310.06↓4.4 years↓
"You may pay 
rather than pay this spell's mana cost. Spend only mana produced by Treasures to cast it this way."
rather than pay this spell's mana cost. Spend only mana produced by Treasures to cast it this way."
Consume Spirit76%
$0.10#13191↑0.12↓22.9 years↑
"Spend only black mana on X."
Drain Life74%
$0.16↑#15637↑0.12↓33.1 years↑
"Spend only black mana on X."
Hogaak, Arisen Necropolis72%
$1.04↑#10626↑0.69↑7.2 years↓
"You can't spend mana to cast this spell."
Hidden Lair72%
$2.73↑#7989↑0.00↓0.2 years↓
"
: Add 
or 
. Activate only if this land entered this turn or if you control a basic land."
: Add or . Activate only if this land entered this turn or if you control a basic land."
Dark Fortress72%
$2.57↑#7168↑0.00↓0.2 years↓
": Add or . Activate only if this land entered this turn or if you control a basic land."
: Add or . Activate only if this land entered this turn or if you control a basic land."
Training Compound72%
$1.35↑#8876↑0.00↓0.2 years↓
": Add or . Activate only if this land entered this turn or if you control a basic land."
: Add or . Activate only if this land entered this turn or if you control a basic land."
Gleaming Bastion72%
$2.03↑#7837↑0.00↓0.2 years↓
": Add 
or . Activate only if this land entered this turn or if you control a basic land."
: Add or . Activate only if this land entered this turn or if you control a basic land."
Gathering Place72%
$1.52↑#8583↑0.00↓0.2 years↓
": Add or . Activate only if this land entered this turn or if you control a basic land."
: Add or . Activate only if this land entered this turn or if you control a basic land."
Realm of Koh70%
$0.47↑#6016↑0.00↓0.8 years↓
"This land enters tapped unless you control a basic land."