See Request (3) - Quests.

This plays into our Morph theme slightly, though it's going to need some tweaking. There's no reason technically why a face-down cast card has to be a creature (unless it's turned face-down by an effect).

Needs some fixing :)

Makes sense, if you ask me - if we're gonna address spellmorph anyway.

Would be better for it to be face-down as a 2/2 creature - otherwise it's hard to see which is what - especially if there are normal morphs in set.

And I really want one of these to have the condition "Have 3 +1/+1 counters on it"

Rules arguments are sure to abound on the turning face up; but I like it, and I like the name for it. The spellmorph name would be more general and likely to be used later, though.

I certainly think a set should contain no more than one of morph (face-down cards are 2/2 colourless creatures), earthform (face-down cards are lands with ": Add "), or agenda (face-down cards are enchantments). There's another variation on hidden agendas where some cards can be exiled face-down, and then cast when a certain condition is met; this also shouldn't be in the same set as any of those, because game tables don't have a separate spot for "exiled cards".

I definitely support face-down cards being used as a means to work towards quests.

yea with so many face down cards, it'll be hard to sort out which is which. besides, a face-down enchantment that does nothing? another besides, everyone knows it's a hidden agenda, just not the specifics. so not very hidden at all.

If all face down cards are 2/2 creatures, we can probably get away with fewer actual creature cards, and replace them with more enchantments and spells, both with morph.

If the hidden agenda is an Aura, then there should be extra rules to allow it to be attached elsewhere as it is turned face-up.