Doran, Besieged by Time {1}{W}{B}{G}
Legendary Creature — Treefolk Druid
Each creature spell you cast with toughness greater than its power costs {1} less to cast.
Whenever a creature you control attacks or blocks, it gets +X/+X until end of turn, where X is the difference between its power and toughness.
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Cards that do something similar 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.
Freelance Muscle 88%
$0.14#17060
"Whenever this creature attacks or blocks, it gets +X/+X until end of turn, where X is the greatest power and/or toughness among other creatures you control."
Wildwood Tracker 87%
$0.05#25084
"Whenever this creature attacks or blocks, if you control another non-Human creature, this creature gets +1/+1 until end of turn."
Burning Sun Cavalry 86%
$0.08#25148
"Whenever this creature attacks or blocks while you control a Dinosaur, this creature gets +1/+1 until end of turn."
Clockwork Vorrac 82%
$0.11#24569
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Beetle 82%
$0.13#19651
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Condor 82%
$0.25#25889
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Dragon 82%
$0.45#20764
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Duskwatch Recruiter // Krallenhorde Howler 82%
$0.28#5979
"Creature spells you cast cost {1} less to cast."
Clockwork Hydra 81%
$0.25#17128
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it. If you do, it deals 1 damage to any target."