Magistrate's Scepter has at least one charge counter on it.
Six.
({B} magic symbol) each turn available.
Steps
Activate Yawgmoth's second ability by paying ({B} magic symbol) ({B} magic symbol) and discarding a card, causing you to put a charge counter on Magistrate's Scepter.
Ezuri triggers, causing you to draw a card.
Repeat from step 1 two additional times.
Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.