Strategic Intervention 

Enchantment
Whenever a creature you control attacks alone, it gets +1/+1 until end of turn. Tap up to one target creature defending player controls.
click a line to search just that ability, click more to combine them
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.
Elite Scaleguard 84%
$0.25#8554
"Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls."
Aetherstorm Roc 81%
$0.29#7755
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls."