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While Alphas Volcanic Island was famously misprinted and excluded from the initial print run, the Beta version became a staple for any deck running blue and red mana

They can block it with whatever they want

The Aetherspark #496 First Place Foil Aetherdrift Change Version The Aetherspark Legendary Artifact Planeswalker Equipment As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Aetherspark." +1: Attach The Aetherspark to up to one target creature you control

If the counter is removed, the ability goes away