You control a nontoken permanent that can be cast using ({C} magic symbol) ({C} magic symbol) .
Steps
Cast
Mana Crypt by paying its mana cost.
Tidespout Tyrant triggers, returning a nontoken permanent that can be cast using ({C} magic symbol) ({C} magic symbol) from the battlefield to your hand.
Activate
Mana Crypt by tapping it, adding ({C} magic symbol) ({C} magic symbol) .
Cast the nontoken permanent returned in step 2 by paying its mana cost.