Hacking A R4 for the Regular DS will play on any Regular DS, right?

[NANASHI89]

Also, how many DS Roms can I run on a card?


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[olec04]

However many can fit on your microsd

 

[The Catboy]

The old R4 (and 1.1 clone) are limited to now-SDHC cards. So you are basically limited to ≥2GB microSD cards.
So it really boils down to what roms you put on it. You can also make a bit more room trimming the ROMs with either the builtin ROM trimmer for Wood R4 or using this tool
https://gbatemp.net/threads/ndstokyotrim-batch-trimmer-with-wifi-detection.55162/

R4 (and the 1.1 clone,) will work on any DS Lite or Phat without hassle. It will not work on the DSi(XL)