Sometimes when playing, it is possible that small moments of lag (at either end, or anywhere inbetween) when performing the draw card (or fire subroutines, if it happens to be damage) actions may lead to the actions being taken twice. Alternatively, it may seem that the interface is unresponsive (I clicked draw 10 seconds ago and it didn't draw, so I'll click it again) leading to mistaken double or triple draws.

I can think of two cases that may cause issues:'

• Multiple 'draw card' or 'fire subroutine' prompts are sent within a small amount of time
• Multiple 'draw card' or 'fire subroutine' prompts are received by the server within a small amount of time

I think that both of these cases could (maybe) be detected serverside, and it may be possible to correct them (ie send prompts instead of executing duplicated actions).