Wagic does not recognize all its keys, but I've got the following bindings to work pretty well:
on your sdcard, edit the files Wagic/Res/settings/options.txt and Wagic/Res/Players/options.txt. Look for the line that says keybindings_sdl=... and replace it with:
keybindings_sdl=45:10,61:3,91:14,1073741899:15,1073741902:13,1073741903:6,1073741904:7,1073741905:9,1073741906:8,1073742094:2
This corresponds to:
Droid X360 key => Wagic (PSP) key
DPad up/down/left/right => up/down/left/right (navigate menus, navigate cards in game)
A => Circle (action button: put a card in play, select a menu option, etc...)
Left Trigger => Left Trigger (ingame: Next phase)
Select => select
Android "back" soft key => "start" (opens the menu)
Analog right nub down => Cross (cancel, interrupt)
Analog right nub up => Right trigger (ingame: show hand)
This is a bit counter intuitive, because a good half of the Droid X360's keys don't register in Wagic. If I have time, I'll look into that.
