Turbine of Dnae

When Turbine of Dnae enters, create a tapped Powerstone token. (It’s an artifact with {t}: Add {c}. This mana can’t be spent to cast a nonartifact spell.)

At the beginning of your upkeep, create X tapped Powerstone tokens, where X is half the Powerstone tokens you control, rounded up.

{2}: Create a tapped Powerstone token