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I don't understand what this do, if I push ok here does the Forest end up ontop or the Game-Trail Changeling?

IIRC, pressing OK will put the forest on top of the library, then since there is only one choice remaining the changeling will be put on top of the forest. The wording can, and will, be made much clearer.

EDIT:What card caused you to put those cards on top of the library?

I believe it was Cream of the Crop, looking forward to the new wording

the problem is that each card (or ability) has a different wording and put cards on top in different orders as well. Take Sensei Divining Top, Ponder, Preordain and Brainstorm as examples.

I think the best solution is to use a single Listbox, with Up/Down buttons like BotArena and MWS already do.

...and a sign/text that explains which end of the list is top of the library