If I control Cynthia and play Pit Rookie, can I give Cynthia a buff from her trigger, spend it to activate Call to Glory, and then buff Cynthia again with Pit Rookie's trigger?

Ruling: Yes, you can buff Cynthia from her trigger, spend that buff to activate Call to Glory, and then buff Cynthia again with Pit Rookie's trigger.

Sequence:

• Cynthia's trigger resolves first, giving her a buff
• You can spend that buff to activate Call to Glory
• Pit Rookie's trigger then resolves, allowing you to buff Cynthia again