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However, it doesnt rule out the possibility of it being available in Wonder Pick events as Bonus Picks

This handy Link Monster basically carries the entire Summoning Mechanic on its back

There are also lots of cards with one of our planeswalkers in name, flavor text, or art that synergize with our gameplan, so they can flesh out the deck a bit

Akroan Horse Akroan Horse offers some interesting deckbuilding possibilities, but its performance is also highly variable

So if you really want to know what promos are Pauper legal, you have to find a list of all common Magic Online promos then MANUALLY LOOK UP EACH CARD to see if it has other online printings (in which case it isn't legal), unless one of those other printings is at Common (in which case it is legal)