25 cards where the rarity is equal to common and the text matches the regex /(whenever|beginning).*mill/

Screaming Phantom (The Lost Caverns of Ixalan #118)
Mindwrack Harpy (Commander Masters #869)
Crawling Infestation (Commander Masters #281)
Tenured Oilcaster (March of the Machine #126)
Unassuming Gelatinous Serpent (Unfinity Sticker Sheets #36)
Water Weird (Alchemy Horizons: Baldur's Gate #41)
Towering-Wave Mystic (Jumpstart #186)
Selhoff Occultist (Jumpstart #174)
Eye Collector (Throne of Eldraine #86)
Sage's Row Denizen (Core Set 2020 #73)
Iceberg Cancrix (Modern Horizons #54)
Tread Mill (Unstable #208)
Shriekgeist (Iconic Masters #72)
Shard of Broken Glass (Shadows over Innistrad #262)
Thassa's Devourer (Journey into Nyx #53)
Crosstown Courier (Duel Decks: Jace vs. Vraska #6)
Chronic Flooding (Return to Ravnica #32)
Curse of the Bloody Tome (Innistrad #50)
Jace's Erasure (Magic 2012 #60)
Screeching Silcaw (Scars of Mirrodin #42)
Halimar Excavator (Worldwake #29)
Drowner Initiate (Shadowmoor #36)
Ink Dissolver (Morningtide #36)
Cephalid Aristocrat (Torment #27)
Reef Pirates (Fifth Edition #116)

Though this query has ended, its relics still slumber in New Argive.