If they are, Sinkhole is an excellent place to start
My goal is by no means to shame you for playing those cards - I just feel the broader EDH format as a whole is becoming quite uniform and samey, in part by people turning to net-decking or using automatic online suggestion tools too often
These qualities make Spheal and its evolutions versatile, if not iconic, within the broader Pokmon ecosystem

Other printings of Manectric $11.03 Manectric Crystal Guardians Manectric SM Black Star Promos $6.25 Manectric Emerald $1.80 Manectric Emerald $1.53 Manectric Mysterious Treasures $0.59 Manectric Primal Clash $0.27 Manectric Celestial Storm $0.49 Manectric Arceus Most valuable cards in Platinum View the full price guide $143.79 Vulpix Platinum $91.31 Giratina LV.X Platinum $49.36 Lotad Platinum $47.53 Shaymin LV.X Platinum $40.49 Swablu Platinum $38.38 Dialga G LV.X Platinum $38.12 Giratina Platinum $37.66 Palkia G LV.X Platinum More cards by Kouki Saitou $2,063.33 Charizard Skyridge $449.00 Moltres Skyridge $425.39 Arceus & Dialga & Palkia GX Cosmic Eclipse Dewgong$379.99 Dewgong Skyridge $309.53 Charizard Crystal Guardians $267.83 Espeon VMAX Fusion Strike $237.50 Kabutops Skyridge $125.73 Charizard-EX XY Black Star Promos Discover Keep browsing Lightning typeLightning type Pokmon cards SetPlatinum Most valuableTop 100 Pokmon cards You might also like...

Yes, lockable cases are highly recommended for retail settings
Many of these players have likely already collected most of the first batch of Promo-A cards available, but the game's latest events have added extras to find too, like those in the Vol 2 pack and Wonder Pick events