These are the most powerful cards that exist* at the common level and therefore have been banned in Pauper gameplay. You can not use any amount of the following cards in your pauper deck.
Arcum's Astrolabe
Cloud of Faeries
Cloudpost
Cranial Plating
Daze
Empty the Warrens
Expedition Map
Frantic Search
Gitaxian Probe
Grapeshot
Gush
Invigorate
Mystic Sanctuary
Peregrin Drake
Temporal Fissure
Treasure Cruise
High Tide
Hymn to Tourach
Sinkhole
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*Last updated July 2020