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Jun 1, 2012 -- 2:48PM, ikegami wrote:

the game simply has you do a second action at the same time

yes, it is possible for two actions to occur to the same object during the event
eg. Planar Cleansing + creature with Totem Armor
eg. The Mimeoplasm entering the field copying and exiling another The Mimeoplasm in a graveyard repeatedly

but, there are cases where they can not as well
eg. Sutured Ghoul entering the field from a graveyard and the player wants to exile Sutured Ghoul
eg. two Mycoloth s simultaneously entering the field can't devour the same creatures

That being said...
a trigger that triggers on a status change has to see the the status of the object before and after the event to trigger.
We can infer that from the [O] ruling and common sense. edit: and CR603.2d

Would you expect Wake Thrasher to trigger from a permanent entering the field in an untapped state?
Of course not, it has to go from tapped to untapped between the two game states to trigger.

Jun 1, 2012 -- 3:19PM, ikegami wrote:

What about during?

The game does not care about "during" under normal circumstances.

The game checks for triggered abilities by comparing the gamestate before the event with the gamestate after the event. For an ability that triggers on a permanent changing status to fire, the permanent must exist both in the gamestate before the event and the gamestate after the event for the game to pick up on the change. If that permanent ceases to exist during the event, the status change cannot be detected and the trigger will not fire.

603.2d seems relevant.

Some trigger events use the word “becomes” (for example, “becomes tapped” or “becomes blocked&rdquo. These trigger only at the time the named event happens—they don’t trigger if that state already exists or retrigger if it persists. Similarly, they don’t trigger if an object enters a zone in that state.
Example: An ability that triggers when a permanent “becomes tapped” triggers only when the status of a permanent that’s already on the battlefield changes from untapped to tapped.

Don't be fooled by the fact that it's talking about a permanent becoming tapped - it's quite clearly meant to apply to all status changes.

Jun 2, 2012 -- 7:57AM, Chaikov wrote:

Something in the lines of «...instead of untapping Paradise, bounce it...» perhaps.     

That would alter behavior with things like Vorinclex, Voice of Hunger .

Jun 2, 2012 -- 7:57AM, Chaikov wrote:

Something in the lines of «...instead of untapping Paradise, bounce it...» perhaps.     

What about;
"Undiscovered Paradise does not untap during your next untap step.
: Add one mana of any color to your mana pool. At the beginning of your next upkeep, return Undiscovered Paradise to your hand."

It's a rather clunky fix, but would solve the problem I think. Alternatively, adding the first line into the use of the land would avoid any problems arising from stuff causing lands to hit play tapped to start with.