Jalask-Iite, Shrine Giant

Jalask-Iite enters the battlefield tapped and
doesn't untap during your next untap step.
As long as Jalask-Iite is untapped, play with
the top card of your library revealed. You may
cast spells from the top of your library with
converted mana costs less than or equal to the
highest converted mana costs among permanents
you control without paying their mana costs.
Awoken after eternity...