BG Undying

every creature has undying, or a leave the battlefield effect. essentially, every black suns zenith is a one sided wrath, which can also cause them to discard if you have a black cat out, or ping em for 2 if you have out perilous myr. solemn simulacrum allows card draw and mana fixing as well. the big deal here is that the -1 -1 counters from bsz will see the +1 +1 counters on your undying creatures, and they negate each other, consequently falling off. 121.3. if a permanent has both a +1 +1 counter and a -1 -1 counter on it, n +1 +1 and n -1 -1 counters are removed from it as a state-based action, where n is the smaller of the number of +1 +1 and -1 -1 counters on it so, this will allow you to repeatedly wipe their field with black suns zenith, bringing your guys back time and time again. the idea seems like quite a powerful one, i just need help polishing it into a consistent, well oiled machine. as always, your advice, tips, comments, and criticisms are welcomed and appreciated.