The Eternal Kingdom

Whenever a permanent you control leaves the battlefield, place 1 counter on this card. For
every 2 counters on this card, reduce the cost
of your spells by {1}.
{4} - target permanent you control gains
protection from a color of your choice until the
end of the turn.
Archangels you control gain indestructible as
long as this card remains on the battlefield under
your control.