Using Doppelgang I copied 4 copies of Deep-Cavern Bat 16 times (along with 12 other targets, so I ended up with only 58 bats due to token limit) and I am still waiting for the ETB triggers to resolve. 37 to go. I've already timed out just from waiting for this so I'm not even getting to take anything from my opponent's hand. There has to be some way to optimize this so that players aren't punished for the playing the game. It's been over 10 minutes now. Not sure why my opponent didn't concede, but here we are.