Their texture breaks up surface tension, allowing the cards to glide past each other rather than sticking together due to hand oil or moisture
They only stick around for one turn, but thats often all you need to swing big, especially with top deck manipulation cards like Sensei's Divining Top
She adds they "also depict the broad and most extreme phenomena that occur in the furthest parts of space," which isn't the kind of stuff you normally see printed on Magic: The Gathering cards
While either of these characters are typically enough to mint a top chase card when they appear as Enchanteds, having them both in the same card like this is pretty special: a fact thats already caught the attention of collectors based on that high market price
X" effects such as [Trigger] or [On Your Opponent's Attack] once during each of your opponent's turns at effectively no cost
Its also just good generally in a deck with generic mana costs and/or that plays multiple spells a turn, such as an aggro deck with cards like Wheel of Fortune and Windfall or a deck with a bunch of artifacts