Cloudpiercer 
Creature — Dinosaur
$0.17 #13512 0.33 6.4 years
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)Reach
Whenever this creature mutates, you may discard a card. If you do, draw a card.
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Cards similar to Cloudpiercer 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.
Rummaging Goblin86%
$0.09↓#10057↑0.00↓14.1 years↑
"
, Discard a card: Draw a card."
, Discard a card: Draw a card."
Mad Prophet86%
$0.03↓#23320↓0.3514.3 years↑
", Discard a card: Draw a card."
, Discard a card: Draw a card."
Charging Strifeknight86%
$0.17#18918↓0.00↓0.4 years↓
", Discard a card: Draw a card."
, Discard a card: Draw a card."
Goblin Picker86%
$0.17#149850.00↓4.0 years↓
", , Discard a card: Draw a card."
, , Discard a card: Draw a card."
Mental Discipline85%
$0.08↓#27380↓0.2927.2 years↑
"
, Discard a card: Draw a card."
, Discard a card: Draw a card."
Glowstone Recluse85%
$0.16↓#7173↑0.00↓6.4 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."+1 more matching line
Academy Raider84%
$0.11↓#20752↓0.00↓13.1 years↑
"Whenever this creature deals combat damage to a player, you may discard a card. If you do, draw a card."
Thunderhead Gunner84%
$0.22↑#155550.22↓1.6 years↓
"Discard a card: Draw a card. Activate only as a sorcery and only once each turn."
+1 more matching line
Gemrazer84%
$0.45↑#3884↑0.286.4 years
"Mutate If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Oread of Mountain's Blaze83%
$0.18↑#20646↓0.00↓6.6 years
"
, Discard a card: Draw a card."
, Discard a card: Draw a card."
Compulsion82%
$0.16↓#133600.2424.6 years↑
", Discard a card: Draw a card."
, Discard a card: Draw a card."
Null Group Biological Assets82%
$0.05↓#25227↓0.00↓0.5 years↓
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Burning-Tree Vandal82%
$0.09↓#21486↓0.06↓7.6 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Reckless Racer82%
$0.10↓#22866↓0.409.6 years↑
"Whenever this creature becomes tapped, you may discard a card. If you do, draw a card."
Volatile Wanderglyph82%
$0.19↑#16609↓0.50↑2.8 years↓
"Whenever this creature becomes tapped, you may discard a card. If you do, draw a card."
Rescue Leopard82%
$0.13↓#18481↓0.11↓1.4 years↓
"Whenever this creature becomes tapped, you may discard a card. If you do, draw a card."
Vaultbreaker81%
$0.06↓#24875↓0.00↓11.6 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Merchant of the Vale // Haggle81%
$0.05↓#133160.50↑6.9 years
"You may discard a card. If you do, draw a card."
Webspinner Cuff81%
$0.22↑#16351↓0.13↓4.5 years↓
"Reach"
Loch Dragon80%
$0.22↑#21243↓0.57↑6.9 years
"Whenever this creature enters or attacks, you may discard a card. If you do, draw a card."