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Yellow Dot Decoder - Fake Prototype Playtest Cards Articles You may have seen @pfm discovery regarding prototype cards, I recommend you read his post which explains the situation very well

2 Ultra Rare Cards

BT1-026 U Digimon Lv.6 Breakdramon Color Red Cost 12 DP 11000 Digivolve Cost 1 Red 3 from Lv.5 Form Mega Attribute Virus Type Machine Dragon Card Text 1 [Effect] Piercing (When this Digimon attacks and deletes an opponent's Digimon and survives the battle, it performs any security checks it normally would.) BT1-030 C Digimon Lv.3 Gomamon Color Blue Cost 3 DP 3000 Digivolve Cost 1 Blue 0 from Lv.2 Form Rookie Attribute Vaccine Type Sea Beast Card Text 2 [Inherited Effect] [On Deletion] Gain 1 memory

It can massively disrupt your opponents while catapulting you ahead in the game