8 cards where the lore includes “donkey”

Assquatch (Unhinged #71)
Ass Whuppin' (Unhinged #117)
Bad Ass (Unhinged #49)
Cheap Ass (Unhinged #5)
Dumb Ass (Unhinged #75)
Fat Ass (Unhinged #95)
Grek the Ogre (Unknown Event #RG05a)
Smart Ass (Unhinged #45)

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