Haste only matters for a single turn obviously enough, so you can find a way to play the adventure half of something one turn, play Galefang with Haste on the next turn, and then cast the creature side of your adventure on the next turn
Cards that contain holo botching (holo bubbles) or swirls (whirlpool-shaped constellations) often command a premium for collectors
Just like Eternal Witness is usually more powerful that Regrowth because you can abuse the creatureness of it, you can flicker, bounce, or recur this for more and more lands (maybe even cards!)
Next up, three more Overs that probably surprised no one
Moreover, that deck cant contain any duplicates, aside from basic lands
10/10's aren't quite there, but they're still a part of the prestigious 2-Hit Club, at least in 20-life formats