I'd recommend avoiding this in case Blizzard takes a dim view :)
I assume it's a loop prevention mechanism. If the game instance on the server detects an infinite loop or more likely either:
- number of same turn actions/draws exceeds a hard limit
- the same thing is happening again and again exceeding a hard limit
....then terminate game.
Only reasonable player outcome in those instances is to consider the game void (and hence a draw). Also that deters exploits such as these as there's no competitive advantage to be gained.
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