The 'mcard' elf variant is only intended for cases where a homebrew needs to access an ESR disc.
It is NEVER intended for use in launching any game backups, though it is possible to do it through uLE, like you described earlier. But that method is really incorrect.
The originally intended method, which I and many others here use, is to use the 'dvdv direct' variant from the r9b package as "mc0:/BOOT/ESR.ELF", so as to boot ESR backup discs with a minimum of fuzz either directly through FMCB or via uLE PS2Disc command.
Using the 'mcard' elf as "mc0:/BOOT/ESR.ELF" is simply wrong.
The 'mcard' elf should only be used for pure homebrew use of pure homebrew ESR discs.
That ESR elf you found now is also known as the GUI version of ESR. Its drivers are comparable to the r9b versions, but the disadvantage is that you always have to pass through this GUI and make your selection of launch method manually.Maybe its some older version? Is there an r9b version, and to be made like that screen, like a program?
Personally I prefer to use the r9b 'dvdv direct' variant, launching it from uLE via PS2Disc command.
Btw: Did you try using the PS2Disc shortcut in uLE at all ?
Best regards: dlanor