Hassan Siqqi, Kadian Captive

When Hassan Siqqi, Kadian Captive attacks, create Nicodemus, a legendary 1/1 black Shadow creature token tapped and attacking. It has "all creatures able to block Nicodemus do so" and "whenever Nicodemus dies put a shadow counter on Hassan Siqqi, Kadian Captive."

At the begging of your upkeep, flip Hassan Siqqi, Kadian Captive, if it has 3 or more shadow counters on it.