Rules Tip of the Day: You can only play a spell via its Evoke cost when you could normally play that spell. Evoke does not change when you may play the spell, only what you pay. Then, if you did play the spell via its Evoke cost, the Evoke ability will trigger when the creature comes into play. When this trigger resolves, you will sacrifice that creature, if able.

Q: If my opponent has Hostility in play and I have Purity in play, and my opponent targets me with a Shock, which Incarnation effect will replace the Shock? If it matters, he played the Shock on my turn.

A: Whose turn it is does not matter; what matters is that you are the player that is about to receive two points of damage from a spell controlled by your opponent. Both Purity and Hostility have static abilities that generate replacement effects. Both of these replacement effects try to apply to what will happen when this damage is dealt. As you are the affected player, you can choose which to apply first. Then you apply the other, if it is still applicable. I assume you'd want to apply the effect form the Purity first, which will prevent the damage and cause you to gain two life. As the damage is now prevented, the effect from Hostility will no longer be applicable, and will do nothing.

Q: Is it possible to activate Militia's Pride several times?

A: No, that ability is a triggered ability, not an activated one. Whenever a nontoken creature you control attacks, the Pride's ability will trigger. For example, if you attack with two nontoken creatures, this ability will trigger twice. When each of these triggers resolves, you can pay W to put a 1/1 attacking Kithkin into play, for a potential total of two. You cannot choose to pay more than one white mana each time one of these triggers resolves.

Q: I have a Guile in play and a Pestermite. My opponent uses Lash Out to kill off the Pestermite and, in response, I flash in Scion of Oona, immediately giving all other Faeries (including the Pestermite) Shroud. Since the Shroud effect is caused by a creature I control, will it trigger Guile's ability to steal my opponent's spell?

A: Your opponent's Lash Out will be countered in this situation, as its single target is not legal when it attempts to resolve. However, it is countered by the rules of the game, not by a spell or ability you control. The fact that your creatures have Shroud may have been what made your creature an illegal target, but that does not mean that the Shroud ability was what caused the spell to become countered. So in this example, Guile's ability will not be applied, and you will not be able to play the Lash Out.

Q: Does Pithing Needle cancel out a planeswalker's abilities?

A: Yes, it can. Planeswalkers in play are permanents. A Pithing Needle can prevent a planeswalker from using its activated abilities while the Needle is in play.

Q: My opponent has Gaddock Teeg in play. I want to play the Rough half of Rough / Tumble. Can I?

A: Yes, the converted mana cost of Rough is two. It does not matter that Rough is half of a split card and that the other half would have a converted mana cost of six if it were played. Gaddok Teeg's ability will not prevent you from playing that half of the card.

Q: I have a Teferi, Mage of Zhalfir and a Sower of Temptation in play. At my opponent's end of turn, I play a Vesuvan Shapeshifter, copying Sower of Temptation. I will gain control of my opponent's creature, but what happens when, during my upkeep, I flip Shapeshifter face-down?

A: Nothing. You still control this permanent; it does not matter that its characteristics have changed. The continuous effect created by the comes-into-play ability of this Shapeshifter / Sower will look to see that the permanent that created the effect is still in play, regardless of what this permanent looks like.

Q: Since Changelings are every creature type, does this mean they can be Disenchanted, like an Enchantment Creature or Artifact Creature?

A: No. Artifact and Enchantment are permanent types; they are not creature subtypes. A creature that is an artifact creature is both an artifact and a creature, but that does not make artifact a creature type.

Q: I use Summoner's Egg, Imprinting Root Elemental. Summoner's Egg goes to my graveyard from play; it instructs me to turn the Imprinted card face-up. Does that cause Root Elemental's "When this is turned face-up" ability to trigger?

A: No. When Summoner's Egg's leaves-play triggered ability resolves, you do turn the removed card face up, but this card is still in the removed from game zone when this happens. Then you put this card, now face-up, into play. Root Elemental's triggered ability can only trigger when it is in play face-down and is turned face-up.

Q: If I play a Ghastly Demise targeting a creature, will the Ghastly Demise count itself when it resolves? For example: I have three cards in the graveyard; can I kill a four-toughness creature?

A: No. Cards that represent instants or sorceries on the stack go to the graveyard as the very last part of their resolution. Ghastly Demise will not be in the graveyard when you apply its one-shot effect as it resolves. Because of this, you will only have three cards in your graveyard in the given example, so the targeted creature will not be destroyed.