I was playing my Izzet Artifacts deck when I encountered a card stack issue involving tokens. I wish I had a screenshot, but let me explain the situation. I was mid-game and had a stack of Thopter tokens (8) and on my turn
Thopter Spy Network created a new Thopter token (/w summoning sickness). My card draw was
Thopter Engineer, which I then played. This created a stack of 10 Thopter tokens.
No issue so far, but then I tapped
Ruins of Oran-Rief to place +1/+1 marker a Thopter token and was presented with no way to search the stack of tokens for the 2 new Thopters. No matter what I tried I could not view individual Thopter tokens within the stack.
However, in the end, I came up with a solution. I attacked with each Thopter (selecting one at a time, so they didn't attack as an entire stack) and then, prior to combat resolving, I tapped Ruins of Oran-Rief and selected from among the new tokens (as they were the only ones I could target from among the attacking Thopters).
I imagine this issue only appears while you have Thopter Engineer in play, as otherwise new Thopter tokens would be in their own stack with summoning sickness. Then again, it's possible multiple Thopter tokens with summoning sickness would create their own stack and prevent you from targeting any token but the one on the top.
Also, as an unrelated issue (but one too small for it's own post), while playing a game that aggressively ended up creating heavy card draw for me and milling my opponent's deck, we were eventually both whittled down to our last ~15 cards. That's when I noticed a 2nd graveyard next to mine (to the left), and no they weren't exiled/grayed cards. When I tried to view it the cards shown to me were all from my opponent's graveyard. Strange.