Guardian of New Benalia 

Creature — Human Soldier
$0.24 #16748 0.04 4.1 years
Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)
Whenever this creature enlists a creature, scry 2.
Discard a card: This creature gains indestructible until end of turn. Tap it.
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Cards similar to Guardian of New Benalia 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.
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"Discard a card: This creature gains indestructible until end of turn. Tap it."
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"Discard a card: Tap this creature. It gains indestructible until end of turn."
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"Discard a card: this card gains indestructible until end of turn. Tap him."
Prognostic Sphinx82%
$0.24#9557↑0.18↑13.1 years↑
"Whenever this creature attacks, scry 3."
+1 more matching line
Necromancer's Familiar80%
$0.07↓#27931↓0.005.3 years↑
"
, Discard a card: This creature gains indestructible until end of turn. Tap it."