Aetherspark can be attacked
The Aetherspark can seemingly be attacked by creatures that are created to be attacking even when it is attached to a creature, but I don't think that should be possible. In this case it was a 1/1 Goblin token from Squee, Dubious Monarch
9
votes
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Rezzahan#77802
commented
Nothing about the Aetherspark stops creatures that are entering attacking from entering attacking it. The Aetherspark cannot be attacked, which means, no attacker can be declared attacking it, when it is attached. But those entering attacking creatures aren't declared as attackers, and so get around the ability.