Morphing a creature and Mana Drain

[DryCow]

If my opponent plays an Exalted Angel face down as a morph creature, and I cast Mana Drain targetting the Morph, how much mana will I get next main phase?

Is the Morph's mana cost 3 because of the morph ability?  Or is it 6 because the card is acutally Exalted Angel, similar to how you get 5 mana for mana draining a misdirection even though they played misdirection without paying it's mana cost?  Or is it zero because morph is strange?

Thanks.

[Methuselahn]

If my opponent plays an Exalted Angel face down as a morph creature, and I cast Mana Drain targetting the Morph, how much mana will I get next main phase?

Is the Morph's mana cost 3 because of the morph ability?  Or is it 6 because the card is acutally Exalted Angel, similar to how you get 5 mana for mana draining a misdirection even though they played misdirection without paying it's mana cost?  Or is it zero because morph is strange?

Thanks.

You get 0.  This is one of the beauties of Hot Momma.  Mana Drain only gives you mana equal to the casting cost, so the morph wouldn't even be considered.  Since it is not an Exalted on the stack, you don't get the mana = to the CC.  This probably isn't a real good technical explanation, but in short, you get 0.

[Jebus]

The technical reason is that, since a face-down creature spell has a converted mana cost of zero, you get zero mana.

[Matt]

More generally, whenever a number on a card isn't defined, the game rules take it to be zero. It's the same reason why an animated land will have a converted mana cost of zero.