how rare are master ball cards Regigigas - Prismatic Evolution - PREFR pokémon card 086/131 [Colorless] What's going on with this

[20] Footnotes [edit source] 1 2 Bruce Schneier (2007-11-15)

Promo Info BOOSTER DIMENSIONAL PHASE [BT-11] CLOSECLOSE BT11-085 U Digimon Lv.5 WaruSeadramon Color Purple Blue Form Ultimate Attribute Virus Type Aquatic DP 8000 Cost 8 Digivolve Cost 1 4 from Lv.4 Digivolve Cost 2 4 from Lv.4 Upper Text [On Play][When Digivolving] You may play 1 purple or blue level 3 Digimon card from 1 of your purple or blue Digimon's digivolution cards without paying the cost

Then you can spend 5 mana, one of each color, to cast your stuff

They can come into play untapped and tap for one of two different colors of mana, but they also have a second ability: you can flip them over to reveal a land that produces a different set of two colors of mana

Card Q&A Q1906 Mar

Is there something I missed here