Spark sabotages itself at first noncreature spell
At the event "Sparky's Challenge".
At first, I saw Sparky returning its first creature to its own hand with the blue deck. It was a 1/1 flying bird. Ok, because later it casted a creature that would gain +1/+1 everytime a flying creature enters.
But then, I saw a similar behavior, also at round 2, but this time Sparky tapped its own wall with an enchantment.
Then it did again some rounds later.
It is for sure a bug.
2
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fog#92305 commented
Also, it has attacked with a 0/5 creature (not shown in the picture). Without any kind of instants before damage.