So yet again legacy decks have brought up a weird scenario that I need clarification on. In Mud list I'm looking into, they play play sets of Chalice of the Void and Trinisphere. If Chalice is set to a value less than three, and Trinisphere makes all spells less than three mana cost three mana to cast, does that mean that the spells that normally would be countered by Chalice aren't countered? Basically, can I have Trinisphere and Chalice out at the same time and they still work in my favor?
No, there’s no real interaction between these cards.
Chalice of the Void cares about the converted mana cost of the card, which is a fixed value a card has.
Trinisphere affects how much you have to spend to cast spells. This is an additional cost, and it follows the normal rules for additional costs.Â
Effects that increase or decrease the cost of spells (such as Trinisphere, or Arcane Melee) don’t have any effect on the spells’ converted mana cost.
For example, a spell with a printed mana cost of 1U has a converted mana cost of 2, even if Trinisphere means you have to spend 3 to actually cast it.