Agent Frank Horrigan 
Legendary Creature — Mutant Warrior
$5.51 #3480 0.30 2.5 years
Trample
Agent Frank Horrigan has indestructible as long as it attacked this turn.
Whenever Agent Frank Horrigan enters or attacks, proliferate twice. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards similar to Agent Frank Horrigan 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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"Whenever this creature attacks, you may pay 
. If you do, it gains indestructible until end of turn."
. If you do, it gains indestructible until end of turn."
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"Trample"
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$24.32↑#2475↑1.72↑9.8 years↑
"At the beginning of your end step, proliferate."
Khenra Spellspear // Gitaxian Spellstalker75%
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"Trample"
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"Whenever this Vehicle attacks, proliferate."
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"Whenever this card attacks alone, he gets +2/+0 and gains indestructible until end of turn."
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"Whenever another nontoken creature you control enters, proliferate."
Felothar, Dawn of the Abzan74%
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"Trample"
Nyxborn Behemoth73%
$1.31↓#7249↓0.41↑3.1 years
"Trample"
Crew Captain72%
$0.04↓#24273↓0.264.4 years↑
"This creature has indestructible as long as it entered this turn."
Primaris Chaplain72%
$0.34↓#15308↓0.47↑3.9 years↑
"Whenever this creature attacks, it gains indestructible until end of turn."
Grave Titan72%
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"Whenever this creature enters or attacks, create two 2/2 black Zombie creature tokens."
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