Sir Asur of Dawnguard

(Partner to Dovakin, Dragonborn, Dawnguard, and Witchers.) When Sir Asur of Dawnguard enters the battlefield, put a X countdown timer on him equal to the number of partners in play.
At the end of the countdown, he is counter
+1/+1 per Partner still in play. Create a Treasure Token per counters added. Remove Partner counters, replace countdown timer.
At the start of your next turn, remove Partner counters and restart countdown.