Ellissence, Mana-Weaver

Changeling, Hexproof, Lifelink, Wither, Haste
{t}: Add {u}, {r}, {g}, or {c}. Put a thread counter
on Ellissence. Spend this mana only to cast an
instant, sorcery, enchantment, or artifact spell.
Remove X thread counters: copy target activated
ability from a permanent that required X mana
to activate. Ellissence gains that activated ability.
(Mana abilities can't be targeted.)