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To refresh on regeneration:

A creature cannot be regenerated once it has reached the graveyard, it must be regenerated as it dies/before the end of the turn.

Right?

Thanks for clearing the previous questions up. I had assumed so but wasn't sure on it.

Why is it if you play a Stonewood Invocation on a Bird of Paradise that's attacking and your opponent plays a Sudden Spoiling before damage, that the Bird of Paradise becomes a 5/7?

The new Tribal Enchantment (I missed the pre-release), can I ferret that out with Amoru Scout // Blightspeaker?

This is the layering rule you're probably talking about.


11/1/2005: You apply power/toughness changing effects in a series of sublayers in the following order: (a) effects from characteristic-setting abilities; (b) all other effects not specifically applied in c, d, or e; (c) changes from counters; (d) effects from static abilities that modify power and/or toughness but don't set power and/or toughness to a specific number or value; and (e) effects that switch a creature's power and toughness.

Now then, Given that layering rule this means two things.
1. Since stonewood invocation is NOT a static effect, ruling it out of layer D, it applies in layer B.
2. Since sudden spoiling defines it's numbers this also eliminates it from layer D. Making it a layer B effect like humility (since the cards are similar in function).
3. We know that if you pump a creature and then a humility/humble is played the pump effect is wiped away from the 'lose all abilities' and 'all creatures become 1/1, 0/1s.' effects.
4. Given the above three this means in your example above since the Stonewood Invocation is played first and the Sudden Spoiling after it, the Sudden Spoiling takes a humility/humble style approach and removes all a abilities and power toughness modifiers applied in all layers equal to or below it. (Meaning the only layer it can't remove is a Layer A effect but since we have none of those in this scenario we don't have to worry). This will make the birds a 0/2 with no abilities because of the timestamp order in which the two spells were played.

Lord Yawgmoth, I think that that's why the tribal enchantments were made, just for that reason. If they weren't made for card effects like that, I really don't see a point for them (yet).

1. You can counter it when he plays it face down as a 2/2 creature spell yes. But if you mean after it hits play can you stop him from turning it face up then no. Morph doesn't use the stack and can't be responded to.

2. No. Targets are chosen before costs are paid. You target the creature you want to bring back from the dead with Dread Return before you sacrifice the three creatures for its flashback cost.

Yes.

Unlike things like Mind's Desire and other weird spells in the Grinning Totem-esque fashion, the totem doesn't say "Play it without paying its mana cost" it just says "Play it as though it were in your hand". That line means you have to pay the mana for any spell you remove with Grinning Totem. So, it's just like you're playing the X spell normally as if you really had one of your own in your hand.