Epistilion, Ages Forgotten

{t}, Pay {1} for each charge counter on Epistilion, Ages Forgotten: Target instant or sorcery you control gains storm until end of turn. Put a number of charge counters on Epistilion, Ages Forgotten equal to that spells converted mana cost.
{2}: Remove a charge counter from Epistilion, Ages Forgotten. Untap it.
Its magic was forbidden for a reason.