1) How much would a duress cost with a Trinisphere and a Sphere of Resistance out in play?
2) How much would a demonic tutor cost with a Trinisphere and a Sphere of Resistance out in play?
3) If I play a wild mongrel, paying 3 mana, and a trinisphere and a chalice of the void for 3 is out, it's not coutnered, correct?
4) A gorilla shaman will always destroy a Chalice of the Void, no matter what they paid, for 1 mana correct? X's in a cards cost are considering 0 when determining CC correct?
Thanks all.
1. SoR makes it cost


, then Trinisphere sees that you've paid less than three mana, so it makes it


.
2. SoR makes it cost


, then Trinisphere looks at it, sees that you're paying three mana, and leaves it at


.
3. Wild Mongrel's converted mana cost is ALWAYS two. The amount of mana you pay for a spell is not the CMC, and so a Chalice with three counters on it can never counter a Mongrel.
4. An X in the CMC of a card is always zero except when it's on the stack. So yes, all Chalices in play have CMC of zero, regardless of what X was or whether any other modifiers such as Trinisphere or Helm of Awakening made you pay more or less.