Study the Classics 

Sorcery
Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it. You gain life equal to the number of +1/+1 counters 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.
Visions of Dominance 98%
$0.94#7545
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it."
Growth Curve 88%
$0.26#11853
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Invigorating Surge 88%
$0.25#3468
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."