Tackle Artist 

Creature — Orc Sorcerer
Trample
Opus — Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, put two +1/+1 counters on this creature instead.
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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.
Electrostatic Infantry 86%
$0.30#6215
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Pyre Hound 86%
$0.17#18547
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
+1 more matching line
Caldera Pyremaw 85%
$0.28#4758
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent."
Molten-Core Maestro 85%
$0.37#9288
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, add an amount of {R} equal to this creature's power."
Spectacular Skywhale 83%
$0.20#19735
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn. If five or more mana was spent to cast that spell, put three +1/+1 counters on this creature instead."
Murktide Regent 82%
$6.53#14883
"Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on this creature."
Quandrix Pledgemage 81%
$0.17#21223
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Dragonsguard Elite 81%
$0.27#15967
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."