Promoter can quickly swarm the field by tributing itself to summon 2 "Battlin' Boxer" and can banish itself to modulate their levels, while Uppercutter helps search "counter" trap cards when it's summoned or sent to the GY via your card effects
You can usually tell when a Pokmon TCG card will be a heavy hitter, value-wise
"Pendulum Evolution", a Continuous Spell with various effects including exchanging a Pendulum Monster in hand with another Pendulum Monster with 2500 ATK from the Deck (which includes "Astrograph Sorcerer" and "Supreme King Gate Magician"), an extra Pendulum Summon or allowing "Z-ARC" to attack multiple monsters (which in turn allows its effect to Special Summon a "Supreme King Dragon" can trigger multiple times)

Mega Gengar ex: Upgraded Version Suggestion Pokmon (19) 2 Gengar ex TEF 104 2 Mega Gengar ex PFL 056 2 Haunter PFL 055 4 Gastly PFL 054 2 Toxtricity PFL 067 2 Toxel PFL 068 1 Mega Absol ex MEG 86 2 Munkidori PRE 44 1 Pecharunt ex SFA 39 1 Fezandipiti ex SFA 38 Trainers (33) 2 Risky Ruins 4 Arven 2 Lillie's Determination 2 Boss's Orders (Ghetsis) 2 Iono 1 Janine's Secret Art PRE 112 1 Dawn PFL 087 4 Buddy-Buddy Poffin 2 Ultra Ball 2 Nest Ball 2 Rare Candy 2 Technical Machine: Evolution sv4 178 1 Night Stretcher 1 Super Rod sv2 188 2 Binding Mochi PRE 95 2 Punk Helmet PFL 092 1 Secret Box TWM 163 Energies (8) 8 Basic Darkness Energy Deck Structure Mega Gengar ex: The Main Star - Ability: Shadow Sneak
While many new collectors are submitting to CGC, they are often still collecting PSA as well
While it may not possess the kind of market value an Umbreon ex SIR can command, its still up there as one of the top chase cards of the era, as well as the single most valuable Destined Rivals card you can pull