Merlin's Tower

Whenever you cast an instant or Sorcery, put a
spell counter on Merlin's tower.
{t}, Remove X Spell counters from Merlin's
Tower: You may cast any combination of instant
or sorcery spells from your hand who's total
combined mana costs equal X or less without
Paying their mana costs, where X is the total
number of Spell counters removed from Merlin's
tower.