If an effect causes The Aetherspark to become attached to a creature while it is being attacked, it will continue to be attacked
If you want to have fun, make some personalized things, and dont really expect to take them out a lot, then you should 100% go for some DIY options
Yes, you read that right: No cheap Commander stuff
Any deck can benefit from dropping it on turn four, grabbing a land for the battlefield, and then passing the turn
Legendary Creature - God Moritte of the Frost Changeling (This card is every creature type.) You may have Moritte enter as a copy of a permanent you control, except it's legendary and snow in addition to its other types and, if it's a creature, it enters with two additional +1/+1 counters on it and has changeling