Stack size limit
It seems there is a limit to how big the stack can get. My best guess is 256. While there are few situations where this is actually a problem I found one using scute swarm on mobile since the number of scutes grow exponentially and each ability triggers separately. Since there is technically no limit in MTG rules about how big a stack can get the game code should be changed to reflect this, increasing the limit by a couple orders of magnitude.
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Darkvampiredrake#77213 commented
The stack has no size limit - I've seen it run well over 600 before. What DOES have a limit is how many identical tokens you can have, which is 250.