Guidance of the Past

Guidance of the Past doesn't untap during your
untap step. If Guidance of the Past was not
tapped this turn, at the beginning of your end
step, untap Guidance of the Past.
{2},{t}: Add 2 mana in any combination of colors.
{4},{t}: Add 5 mana in any combination of colors.
Spend this mana only to cast Avatar spells or
activate abilities of Avatars.