Independence Mode gave us a mode with no cards (technically a few cards, just automatic and pre sent). How would you feel about a mode being able to send ALL the cards? And to help speed things up, the experience curve never goes up, so shipments are plentiful and comes blazing fast, especially by late game.
And to expand on that, maybe even ALL the Age Up options. Italians can get both strong Mercenaries AND Leonardo's Tank (and maybe even make it replaceable) for example. Aztecs can have super strong eco, defensive buildings, and War Chief. Federal Americans can have all types of additional card interactions from their States. Asians can build (and rebuild) all Wonders (and by extention, Factories and Forts can be rebuilt by everyone too).
And to go further, card and techs that replaces units simply adds the units without taking existing ones away.
And to go even further, ALL Revolts are available, like they just come with being in the Industrial Age (or whatever Age it unlocks at). There probably needs to be a new card UI for this, cause Mexicans alone have like seven separate decks.
And if I may be so bold, make map Mercenaries and Outlaws available AND viable for everyone even in the late game.
And for added debauchery and excess, make all cards that can be renewed in Imperial infinite, so you can keep sending any and all resource and unit shipments. (Might want to cap Nuestras Señoras at twice though in the name of balance, or not in the name of fun.)