Transdimensional Snowglobe

{x}{t}: Target artifact you control, with converted mana X or less, is stored within Transdimensional Snowglobe. Artifact(s) stored within Transdimensional Snowglobe are phased out.
{t}: Remove target artifact that is stored within Transdimensional Snowglobe. This artifact is no longer considered phased out and becomes tapped.

If Transdimensional Snowglobe phases out, is explodes dealing X damage to all players, X being the total converted mana cost of all stored artifacts, then exile Transdimensional