Pollywog Symbiote 
Creature — Frog
$0.22 #9080 0.05 6.4 years
Each creature spell you cast costs less to cast if it has mutate.
less to cast if it has mutate.Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.
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Cards similar to Pollywog Symbiote 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.
Customs Depot86%
$0.19↓#27314↓0.0526.9 years↑
"Whenever you cast a creature spell, you may pay . If you do, draw a card, then discard a card."
. If you do, draw a card, then discard a card."
Riddlesmith80%
$0.19↓#5538↑0.21↑15.9 years↑
"Whenever you cast an artifact spell, you may draw a card. If you do, discard a card."
Planar Gate80%
$77.60↑#21320↓0.68↑32.3 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Hazoret's Monument76%
$1.48↑#1913↑0.139.4 years↑
"Whenever you cast a creature spell, you may discard a card. If you do, draw a card."
+1 more matching line
Honest Rutstein76%
$0.39↑#1787↑0.19↑2.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Coralhelm Chronicler76%
$0.06↓#23160↓0.095.9 years
"Whenever you cast a kicked spell, draw a card, then discard a card."
Heartless Summoning74%
$1.42↑#2793↑0.25↑14.9 years↑
"Creature spells you cast cost less to cast."
less to cast."
Academy Wall74%
$0.24↑#13217↓0.29↑4.0 years↓
"Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card. This ability triggers only once each turn."
Marauding Raptor74%
$0.91↑#3000↑0.18↑7.2 years
"Creature spells you cast cost less to cast."
less to cast."
Herald's Horn74%
$1.97↑#150↑0.21↑9.0 years↑
"Creature spells you cast of the chosen type cost less to cast."
less to cast."
The Sibsig Ceremony72%
$0.31↑#97730.31↑1.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Urza's Incubator72%
$18.41↑#316↑0.52↑27.2 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Baron Strucker, HYDRA Overlord72%
$0.19↓#87760.000.2 years↓
"Villain spells you cast cost less to cast."
less to cast."+1 more matching line
Jeskai Ascendancy72%
$1.63↑#2867↑0.35↑11.9 years↑
"Whenever you cast a noncreature spell, you may draw a card. If you do, discard a card."
Rhonas's Monument72%
$1.29↑#2145↑0.16↑9.4 years↑
"Green creature spells you cast cost less to cast."
less to cast."
Duskwatch Recruiter // Krallenhorde Howler70%
$0.32↑#6005↑0.0510.4 years↑
"Creature spells you cast cost less to cast."
less to cast."
Shadow in the Warp70%
$18.73↑#3477↑0.53↑3.9 years↓
"The first creature spell you cast each turn costs less to cast."
less to cast."
Warden of Evos Isle70%
$0.18↓#3851↑0.1313.1 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Seeker of Insight70%
$0.05↓#27303↓0.25↑9.4 years↑
"
: Draw a card, then discard a card. Activate only if you've cast a noncreature spell this turn."
: Draw a card, then discard a card. Activate only if you've cast a noncreature spell this turn."
Oketra's Monument70%
$3.10↑#1033↑0.20↑9.4 years↑
"White creature spells you cast cost less to cast."
less to cast."