It can also protect itself from being destroyed
P-223 P Digimon Lv.6 Kuzuhamon Color Purple Yellow Cost 11 DP 11000 Digivolve Cost 1 PurpleYellow 3 from Lv.5 Form Mega Attribute Data Type Shaman Card Text 1 [Special Digivolution Condition] [Digivolve] Lv.6 w/[Maid Mode] in name: Cost 1 [Effect] When this card would be played, if you have 3 or fewer security cards, reduce the play cost by 4
Raticate's Stats: Type: Colorless Stage: Stage 1 Generation: Gen 1 HP: 80 Retreat Cost: 1 Colorless Energy Attacks: Bite deals 40 damage and costs 1 Colorless Energy It's not that Raticate is unusable, it's just that Raticate isn't the best choice to pad out a deck with
Theyre cheap to print, they make gameplay smoother, and they let you go full haunted-house mode without rewriting your entire deck
In many cases yes, but again that entirely depends on the definition youre using
Pearl Medallion will discount nearly every card in your deck as you are only playing white cards