Stalwart Successor {1}{B}{G}
Creature — Human Warrior
Menace (This creature can't be blocked except by two or more creatures.)
Whenever one or more counters are put on a creature you control, if it's the first time counters have been put on that creature this turn, put a +1/+1 counter on that creature.
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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.
Rite of Passage 89%
$4.99#5841
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Enduring Scalelord 84%
$0.30#10894
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
Battlefront Krushok 82%
$0.11#15355
"Each creature you control with a +1/+1 counter on it can't be blocked by more than one creature."
+1 more matching line
Formation Breaker 81%
$0.08#21007
"As long as you control a creature with a counter on it, this creature gets +1/+2."
Necropolis Regent 80%
$0.55#3951
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Sphere Grid 80%
$8.87#1407
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Cazur, Ruthless Stalker 80%
$0.38#7935
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."