Goblin Maskmaker 
Creature — Goblin Citizen
$0.04 #21912 0.05 2.7 years
Whenever this creature attacks, face-down spells you cast this turn cost 
less to cast.
less to cast.Click a line or tag to filter
Cards similar to Goblin Maskmaker 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.
Dream Chisel90%
$4.56↑#13931↑0.0024.0 years↑
"Face-down creature spells you cast cost less to cast."
less to cast."
Obscuring Aether87%
$0.19↑#11591↑0.0011.6 years↑
"Face-down creature spells you cast cost less to cast."
less to cast."
Hardened Berserker86%
$0.04#243520.0011.6 years↑
"Whenever this creature attacks, the next spell you cast this turn costs less to cast."
less to cast."
Kadena, Slinking Sorcerer86%
$0.44↑#12555↑0.22↑7.2 years↑
"The first face-down creature spell you cast each turn costs 
less to cast."
less to cast."
Panoptic Projektor84%
$0.31↑#9442↑0.062.7 years
"
: The next face-down creature spell you cast this turn costs less to cast."
: The next face-down creature spell you cast this turn costs less to cast."
Cheering Fanatic78%
$0.12↑#202150.008.4 years↑
"Whenever this creature attacks, choose a card name. Spells with the chosen name cost less to cast this turn."
less to cast this turn."
Valakut Fireboar70%
$0.19↑#27800↓0.0016.5 years↑
"Whenever this creature attacks, switch its power and toughness until end of turn."
Stone Calendar70%
$14.91↑#205420.37↑32.2 years↑
"Spells you cast cost less to cast."
less to cast."