Ghost: Must be defeated after he Summons "Meklord Emperor Wisel "
You need: Three Hoothoot (Temporal Forces, 126) Three Bouffalant (Stellar Crown, 119) Two Noctowl (Temporal Forces, 127) Two Terapagos ex (Stellar Crown, 128) Two Snorlax (Lost Origin, 143) One Lumineon V (Brilliant Stars, 40) One Fezandipiti ex (Shrouded Fable, 38) One Noctowl (Stellar Crown, 115) One Fan Rotom (Stellar Crown, 118) One Radiant Greninja (Astral Radiance, 46) The Bouffalant help to mitigate damage, while Fan Rotom, Radiant Greninja, and Lumineon V make finding specific cards to set up with a lot easier
Im going to have to think about this for Standard but I can tell you that this is going to be a chase Commander card
Additionally, Realms and Relics cards can be found in Collector Boosters in non-foil and surge foil