Itzama the Crested

Haste
Avatar spells you cast cost {w}{u}{b}{r}{g} less to cast.
(This only reduces the amount of colored mana you pay)
Whenever an Avatar enters the battlefield
under your control, you may have Itzama the
Crested become a copy of that creature, except its
name is still Itzama the Crested, its legendary, and
has this ability.