Pollywog Symbiote 
Creature — Frog
$0.23 #9229 0.19 6.5 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%
$0.17↓#27543↓0.06↓27.0 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%
$0.20↓#5573↑0.1916.1 years↑
"Whenever you cast an artifact spell, you may draw a card. If you do, discard a card."
Planar Gate80%
$74.69↑#21434↓0.38↑32.4 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Hazoret's Monument76%
$0.57↑#1914↑0.209.5 years↑
"Whenever you cast a creature spell, you may discard a card. If you do, draw a card."
+1 more matching line
Honest Rutstein76%
$0.38↑#1855↑0.162.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Coralhelm Chronicler76%
$0.07↓#23534↓0.05↓6.1 years
"Whenever you cast a kicked spell, draw a card, then discard a card."
Heartless Summoning74%
$1.63↑#2677↑0.37↑15.1 years↑
"Creature spells you cast cost less to cast."
less to cast."
Academy Wall74%
$0.19↓#13362↓0.00↓4.1 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%
$0.85↑#3049↑0.197.3 years
"Creature spells you cast cost less to cast."
less to cast."
Herald's Horn74%
$2.80↑#151↑0.249.2 years↑
"Creature spells you cast of the chosen type cost less to cast."
less to cast."
Jeskai Ascendancy72%
$2.00↑#2707↑0.45↑12.1 years↑
"Whenever you cast a noncreature spell, you may draw a card. If you do, discard a card."
The Sibsig Ceremony72%
$0.35↑#88420.121.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Urza's Incubator72%
$20.34↑#311↑0.62↑27.4 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Baron Strucker, HYDRA Overlord72%
$0.20↓#78080.210.3 years↓
"Villain spells you cast cost less to cast."
less to cast."+1 more matching line
Rhonas's Monument71%
$0.42↑#2126↑0.279.5 years↑
"Green creature spells you cast cost less to cast."
less to cast."
Duskwatch Recruiter // Krallenhorde Howler70%
$0.32↑#5988↑0.2110.5 years↑
"Creature spells you cast cost less to cast."
less to cast."
Shadow in the Warp70%
$16.28↑#3603↑0.45↑4.0 years↓
"The first creature spell you cast each turn costs less to cast."
less to cast."
Warden of Evos Isle70%
$0.18↓#3779↑0.04↓13.3 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Seeker of Insight70%
$0.06↓#27417↓0.179.5 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%
$3.33↑#1051↑0.209.5 years↑
"White creature spells you cast cost less to cast."
less to cast."