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Rules Tip of the Day: Tapping or untapping an attacking or blocking creature does not remove it from combat.
Q: Can you Stifle the Epic effect on the spell?
A: Do you mean use Stifle to counter the creation of the Epic effect when a spell with Epic resolves? If so, no. That is not an activated or triggered ability. It is part of the effect of this resolving spell.
However this effect does two things, it prevents the controller of this spell from playing any spells or abilities for the remainder of the game and it creates a delayed triggered ability. This delayed triggered ability will go on the stack in each of this players successive turns and create a copy of the Epic spell (however without the Epic ability). This delayed triggered ability can be countered, so you can use Stifle to prevent this Epic spell from going on the stack this turn.
Q: I have a Stampeding Serow and two Eternal Witnesses in play. During my upkeep, I select an Eternal Witness to return to my hand (not a targeted ability, I believe). My opponent tries to cast Terror on that Witness in response. Can he do this, and prevent me from getting the card I need in my graveyard (by recasting the Witness)?
A: No, what your opponent wants to do does not work. As you pointed out, the ability of Stampeding Serow does not target. This means that when this upkeep triggered ability resolves you choose a Green creature you control and return it to your hand. No one will get priority in between when you make your choice and return this creature to your hand.
Q: If I play three spells and then play Erayo, Soratami Ascendant, does it flip when it comes into play counting itself as the forth spell?
A: No. Erayo only flips when its triggered ability resolve and this ability only triggers when it is in play and the fourth spell that turn is played. In this example it is on the stack when the fourth spell is played (because it is the fourth spell) so its ability can not trigger.
Q: I have a Kagemaro, First to Suffer and a Promised Kannushi in play. If I activate Kagemaro (with more than one card in hand), will Kagemaro be a legal target for Promised Kannushi's Soulshift?
A: Yes, because you sacrifice Kagemaro when you activate that ability, it will be in the graveyard when Promised Kannusi's Soulshift triggered ability goes on the stack.
Q: If I imprint Ideas Unbound and Eternal Dominion on Spellweaver Helix and then play another Ideas Unbound will the epic ability trigger on the copy of the Eternal Dominion?
A: Yes. The only time the Epic ability is not part of a copy of an spell with Epic is when the copy is created due to the Epic effect. Copies of an original Epic spell created by other effects will have the Epic ability.
Q: Can I activate a Skullmane Baku targeting my opponent's creature without removing one of the Baku's counters? The game situation was that my opponent had Fumiko the Lowblood, and to avoid attacking with the Skullmane Baku (which had one counter on it) I activated it targeting Fumiko, and removing 0 counters. Is that allowed?
A: Yes that is legal. Whenever you are given the choice to choose a value for X, you can choose X to be zero. If you do the ability will not impact the game when It resolves, but the Baku will not have to attack.
Q: Player A has an active Goblin Wielder and an Uba Mask in play. That player also has a Mox Ruby in their graveyard.
It is player B's turn and they are now in the draw phase. Player A wishes to have the Uba Mask's effect of having the card drawn removed from the game and then activate the Wielder to remove his own Uba Mask to his graveyard for the Mox Ruby. What effect does this have on the card drawn?
A: It won't directly affect this card, but Player B won't be able to play it and it will remain removed from the game. You can only play the cards removed from the game by Uba Mask during the turn they are removed and as long as Uba Mask is in play.
Q: My opponent controls two lands, Cranial Plating and an Myr Enforcer. I play Shatterstorm, and he plays Dispersal Shield targeting the Shatterstorm. Can I respond to it by destroying his Myr Enforcer to prevent him from countering my spell?
A: Yes. Dispersal Shield does not check the converted mana costs of the permanents this player controls until it resolves. If you can destroy the Myr Enforcer in this instant, then the highest converted cost among permanents he controls will be two, and the Shatterstorm will not be countered.
Last week, I started to answer the question: What Will Dr. Romeo Be Playing at Regionals? Today we continue seeking an answer to that questions, pushing White... 
