Mox of Ruby

{t}: Add {r} to your mana pool. Spend this mana
only to cast an instant spell.
Whenever you cast an instant spell with a mana produced by Mox of Ruby, put a charge counter
on Mox of Ruby. Then, if Mox of Ruby has
more than three charge counters on it, sacrifice
it.
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If you use all of your energy, use your jewelry.