Uldaea, Starglade's Wisdom

{t}, Tap another untapped Druid you control:
Add three mana in any combination of colors.
Whenever you cast a creature or enchantment
spell, if all of the mana spent to cast that spell
was produced by a Druid, copy that spell. If the
copied spell is an Aura, you may choose new
targets for it.
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"Within each of you lies the potential of a star."