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You can't choose to spend more mana to cast Wurmquake than you're asked to just to make a bigger Wurm

You can set up the general context of the call ("I'm in a Magic game and I need someone outside the game to make a choice"), but you shouldn't explain anything that's going on in the game or what the consequences of their choice may be

It becomes a 0/0 Spirit creature in addition to its other types

Because you never "cast" a land card, Eladamri, Korvecdal doesn't allow you to play a land creature (such as Dryad Arbor) from the top of your library

When another creature you control leaves the battlefield, transform Aang at the beginning of the next upkeep