Meltdown

[Blue Lotus]

If trinisphere is in play, and I cast meltdown for 2R, do I destroy all 0cc artifacts or all 2cc and below?

[Anusien]

It depends, what is X?  If X=2, then you destroy all artifacts with converted mana cost 2 or less.  If X is 0, then you're forced to pay 2R, but you only destroy all artifacts with converted mana cost 0.  Trinisphere does not change casting costs or the value of X, it merely makes things more expensive.

[Harlequin]

Its actually up to you.  Before you pay for Meltdown you declare the value of X.  So you announce I am casting Meltdown with X = 2.  Now you derive the cost.   = 2 = +   =    Trinisphere says "ok, I got no beef with you"
Or you could say I annouce I am casting Meltdown with X = 0.  Now   = 0 = + = now Trinisphere says "Hey you didn't pay 3, so I will increase the cost you pay to "  this does not change the value of X.

[Blue Lotus]

Ok thanks a bunch