mtg core set 2021 booster box Magic: The Gathering: Play in style Wizards of The Coast Magic:

Casting Cost: Card Text: 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 may loyalty counters on The Aetherspark" +1: Attach The Aetherspark to up to one target creature you control

That result puts a full sealed box in the same conversation as many graded grails

Each upkeep, every player exiles the top card of their library

To go a little deeper, it's a static ability that functions in any zone from which you could play the card it's on (e.g., your hand, exile, commander zone)

4) Ionos Bellibolt ex (130/100) The Ultra Rare Ionos Bellibolt ex boasts the claim of being the most expensive UR in Battle Partners, coming in ahead of Ns Zoroark ex and Spike Energy