A Hundred Realities

When A Hundred Realities enters the battlefield,
if you cast it, take an extra turn after this one.
As long as A Hundred Realities is on the
battlefield or in your graveyard, your opponents
can't cast spells during extra turns.
{5}, Pay 10 life, Sacrifice A Hundred Realities:
Take an extra turn after this one. This ability
can't be activated during extra turns.