Limited-print cards, popular alternate art cards, tournament staples, and sought-after promotional releases may appreciate if collector demand remains strong
If used early, it won't be a huge setback if Mantyke is KO'd, plus players may be able to use it more than once
For a lighter application (get it, they are LIGHT) Cyber Dragon Herz makes it so the second mill from Horizon also comes with an upside
As I mentioned in another post, Ive managed to acquire a few packs of Disney Lorcana cards at various D23 events in the last year
Defeat Means Friendship: In the Duel Monsters anime, Red-Eyes Black Dragon switches its owner very often
At common, Cryoshatter helps you reach the late game, while Fungal Colossus rewards you for having differently named lands, such as basics in your splash colors