A disciplined deckbuilder with over 200 lists to his name, Aaron has spent the past several years creating content about his favorite format.
Sorcery-schmorcery, who cares if it isnt Instant
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on in response to Sarkhan's ability
While there are plenty of other extra turn spells, Capture of Jingzhou is one of the most efficient versions of this effect without any additional conditions
The effect will legally resolve even if the auto-ability is activated and a [Job (Avalanche)] Forward is removed from the field before the point of resolution
So long as your deck is full of creatures with CMC 3 or less, Bygone Bishops requirement to Investigate isnt too troublesome