Rules Tip of the Day: Shadow of Doubt, a new card from Ravnica, prevents players from searching their libraries until the end of the turn when it resolves. This will not counter spells and abilities that cause a player to search their library, but it will negate that portion of the effect. In most cases players will still shuffle their libraries even if they cannot search, as Shadow of Doubt does not prevent that portion of an effect from occurring.

Q: If Bottled Cloister is destroyed during an opponent's turn, while your hand is removed from the game, do you get your hand back, or does it stay removed from game?

A: The only way the cards that have been removed from the game can return is if Bottled Cloister remains in play and its ability triggers at the beginning of your next upkeep. If it is destroyed while your hand is removed from the game, then these cards will remain there.

Q: When you activate Terrarion when do you name the color of mana that will be put into your mana pool? I have heard conflicting rulings. Do you name the color before you draw or after?

A: Terrion's first ability is a mana ability that does not use the stack. When you play this ability you pay two mana, tap it, sacrifice it and choose which two colors of mana to generate. The second ability that causes you to draw a card is a triggered ability that does use the stack. This ability will not even go on the stack, let alone resolve, until after you have chosen and generated the mana from Terrion's ability.

Q: I play Clone and choose to copy a Quicksilver Elemental in play. If I enchant this Clone with Followed Footsteps, when the Footsteps upkeep triggered ability resolves will I get a Clone token, thus choosing a new creature to copy, or a Quicksilver token?

A: You will keep getting a token copy of Quicksilver Elemental. Copy effects are the only ones that are duplicated by other copy effects. So this token will copy the effect from your original Clone and come into play as a copy Quicksilver Elemental.

Q: If I activate Sunforger's second ability and use it to search for and play an Arcane card, can I splice cards onto it if I pay the splice card's costs?

A: Yes, you can. You are still playing this searched for red or white Arcane instant, so you can choose to splice the text of other cards onto this spell just as if you were playing it normally.

Q: Say I am playing combo and play Chord of Calling, where X is 23. Can I bring out a creature with X in the casting cost? I'm thinking specifically of Maga, Traitor to Mortals.

A: What you want to do does not work. You do not get to choose a value of X if you put Maga, Traitor to Mortals directly into play. You can only choose a value for X if you play this spell from your hand. You can use Chord of Calling to get Maga, Traitor to Mortals as long as the value for X in the Chord of Calling is at least three. But as you are not playing this Maga spell the value of X will be zero. So this Maga will come into play, its ability will trigger, but the targeted opponent will lose zero life.

Q: Can I Transmute a Muddle the Mixture to get a Fire / Ice from my library? Is it the same principle that allows me to imprint a Fire / Ice in an Isochron Scepter?

A: You are correct. You can Transmute Muddle the Mixture to get a split card as long as one of the halves has the converted mana cost of 2.

Q: When I sacrifice an Gamekeeper to flashback a Cabal Therapy, which effect goes on the stack first, the Gamekeeper's graveyard trigger, or the flashbacked Cabal Therapy?

A: The first thing that happens when you play a spell or ability is it goes on the stack. As you sacrifice the Gamekeeper during the announcement of Cabal Therapy, the Cabal Therapy is already on the stack at this point. This means that the Gamekeeper ability will go on the stack on top of the Cabal Therapy spell and resolve first.

Q: Does Doomsday go to the graveyard when it resolves, or if you didn't choose it to be one of the 5 cards is it removed from the game with the rest of you library?

A: First of all, Doomsday does not leave the stack until after you have chosen the five cards in your graveyard and library. In other words you cannot choose the Doomsday itself as one of the five cards to stack your deck with. You can choose another Doomsday in your library or graveyard, but not the one resolving.

You take the chosen five cards, make them your library and remove the rest from the game while Doomsday is resolving. Then as the final part of the resolution of Doomsday you put the Doomsday in your graveyard. At this point it will be the only card there as you removed the rest form the game.