Firelink Shrine

Whenever Firelink Shrine enters the battlefield
or becomes tapped, create an Estus Flask token.
(It's an artifact with "{1}, {t}, Sacrifice this artifact:
You gain 1 life..")
{t}: Add {1} to your mana pool.
{t}, Pay 1 life: Add one mana of any color. Spend
this mana only to cast a creature spell.