We solve low-speed card problem for MvD(U) yesterday.
But we found you may get a black screen at stage6-2, so we updated again.
Changelog:

2010/11/23
add a card reading function patch
MvD(U) should work on almost slow cards now.

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2010/11/22
Still some slow cards users cant run Mario vs Donkey Kong: Mini-land Mayhem! (U), so we improved the card read speed again.
We had tested with some microsd cards we have, works on all of them.
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2010/11/18
We saw there are still some users report Mario vs Donkey Kong: Mini-land Mayhem! (U) does not work with the patch of 16th
Maybe their microsd card is too slow, so we set the card speed to the max for Anti-Piracy check.
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2010/11/16
Fixed bugs of Mario vs Donkey Kong: Mini-land Mayhem! (U)
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2010/11/13
Fixed New Carnival Funfair Games(EUR) with PATCH mode

Download Patch
Source- Supercard