Datacards rhymes with:
bankcards, flashcards, mastercard's, mastercards, postcards, safecard's, scorecards, backyards, bankcards, blowhards, bodyguards, boulevards, courtyards, diehards, flashcards, graveyards, hildegardes, junkyards, lifeguards, lumberyards, mastercard's, mastercards, postcards, safecard's, safeguards, scorecards, shipyard's, shipyards, stockyards, sungard's, vanguard's
Datacards sounds like:
decurtis, degrades, descartes, descartes's, desecrates, deserts, desserts, diacritic, discards, discredits, djakarta's