Portal of the Titans

At the beginning of your upkeep, put two rebuild counters on Portal of the Titans, then you may
put a nonland permanent with converted mana
cost less than or equal to the number of rebuild counters on Portal of the Titans onto the battlefield.
{5}: Put a rebuild counter on Portal of the Titans,
then you may put a nonland permanent with converted mana cost less than or equal to the
number of rebuild counters on Portal of the
Titans onto the battlefield.