It rewards you with powerful abilities whenever a land comes into play, regardless of whether you played it or put it onto the battlefield with a ramp spell
Find 1 Silver Prizm per pack
Lets check out the most exciting cards
Umbreon ex (Night): 60 Foil cards: 2 Umbreon ex, 3 Eevee, Toxtricity line (3 Toxtricity, 3 Toxel), 2 Zeraora (MEP 103, Ill Rare), 2 Chi-Yu, Yveltal, Emolga
If you want to summon in Hidden ATK or Hidden DEF Position an Integration Summon you are not forced to reveal the eroded material card right away, but when you erode it you must set it clearly apart from other cards, and once your monster is revealed or the duel ends you must reveal that the eroded card was the proper material, otherwise you lose the duel instead
Upgrading them is also a ton of fun because it lets you personalize a deck without jumping straight to a wholly unique decklist