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It has to be a generic philistine. Not all cards that are generic will say so specifically on their card, but you can find a list in the REG (in Glossary of Terms, under Generic Cards).Philistine Armor Bearer is generic, as are some other Philistines (like Philistine Garrison and Philistine Priests), but you can look in that listing to determine whether they are or not.Also, note that you do not have to discard Outpost to use it, because you can discard it "or an evil card from deck" to do the search. That means evil enhancements, evil characters, evil forts or doms (don't do the last part generally...), etc. The most common use is to discard Philistine Armor Bearer from your deck, search your discard pile for it, then use it to go to your deck for another Philistine. When it goes to discard for real, you pull it back out by discarding any evil card in deck (or even the Philistine you wanted to get out of deck, so that you can pull it back out with Armor Bearer). Fun combos with it.