Enchantment â Aura
When Frenzied Fugue enters the battlefield or at the beginning of your upkeep, gain control of enchanted permanent until end of turn. Untap that permanent. It gains haste until end of turn.
You wonâ€™t control the enchanted permanent as your upkeep begins. Any â€œat the beginning of your upkeepâ€ abilities it has wonâ€™t trigger during your upkeep (unless you already controlled the permanent). Similarly, if you have an â€œat the beginning of your upkeepâ€ ability that targets a permanent you control, that ability canâ€™t target it.
The triggered ability triggers both when Frenzied Fugue enters the battlefield and at the beginning of your upkeep. You donâ€™t have to choose only one.