Astral Meteor

When Astral Crash Site enters the battlefield,
you may reveal a Astral card from your hand. If
you don't, Astral Crash Site enters the battlefield tapped.
When Astral Crash Site enters the battlefield untapped, Astral spells you cast have flash until
your next untap step
{t}: add one mana of any color. Spend this mana
only to cast astral spells.