Motivated Pony 

Creature — Horse
Trample, haste
Whenever this creature attacks, attacking creatures get +1/+1 until end of turn. If a Food entered under your control this turn, untap those creatures and they get an additional +2/+2 until end of turn.
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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.
Brightfield Mustang 85%
$0.13#15885
"Whenever this creature attacks while saddled, untap it and put a +1/+1 counter on it."
Jelenn Sphinx 84%
$0.08#23761
"Whenever this creature attacks, other attacking creatures get +1/+1 until end of turn."
Honored Crop-Captain 84%
$0.12#14586
"Whenever this creature attacks, other attacking creatures get +1/+0 until end of turn."
Lattice-Blade Mantis 83%
$0.09#22499
"Whenever this creature attacks, you may remove an oil counter from it. If you do, untap it and it gets +1/+1 until end of turn."
Demolisher Spawn 82%
$0.31#5994
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, other attacking creatures get +4/+4 until end of turn."
+1 more matching line
Renegade Warlord 82%
#30962
"Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn."
Nav Squad Commandos 82%
$0.03#29429
"Whenever this creature and at least two other creatures attack, this creature gets +1/+1 until end of turn. Untap it."