Arcane Lockbox

{2} Counter target sorcery or instant, and put it underneath this card, then put X time counters
on this card. If there are already time counters on
this card when you attach another spell, remove
them and put X on this card.
When there are spells attached to
this card, and no more time counters, sacrifice
Arcane Lockbox and all the spells that are
attached to this card are played.