By Set and Card Number The simplest way of how to organize pokemon cards is by set and number
A new in-game event just dropped in Yu-Gi-Oh
DUAD-EN089 Psychic Omnibuster Common WIND Level 7 Psychic/Synchro/Effect 2500/2000 1 Tuner + 1+ non-Tuner Psychic monsters Each time your opponent activates a card or effect on the field (except during the Damage Step): You can pay 2000 LP and declare 1 card type (Monster, Spell, or Trap) (but you can only declare each card type once per turn to activate this effect of Psychic Omnibuster)
If you're not as keen on Gengar, then Phantom Forces also has two Mega Manectric cards to collect, though Gengar is probably the reason you'd buy this set

V-Pet Version 1 Baby Botamon Born from Egg Koromon Botamon: Wait about 60 minutes Child Agumon Koromon: 0-3 Care Mistakes Betamon Koromon: 4+ Care Mistakes Adult Greymon Agumon: 0-3 Care Mistakes, Train 32+ Tyranomon Agumon: 4+ Care Mistakes, Train 5-15, Overfeed 3+, 0-4 Sleep Disturbances Devimon Agumon: 0-3 Care Mistakes, Train 0-31 Betamon: 0-3 Care Mistakes, Train 48+ Meramon Agumon: 4+ Care Mistakes, Train 16+, Overfeed 3+, 0-6 Sleep Disturbances Betamon: 0-3 Care Mistakes, Train 0-47 Airdramon Betamon: 4+ Care Mistakes, Train 8-31, Overfeed 0-3, 9+ Sleep Disturbances Seadramon Betamon: 4+ Care Mistakes, Train 8-31, Overfeed 4+, 0-8 Sleep Disturbances Numemon Agumon/Betamon: When you do not fulfill the requirements of other Digimon Perfect MetalGreymon Greymon/Devimon/Airdramon: Perfect level requirements Mamemon Tyranomon/Meramon/Seadramon: Perfect level requirements Monzaemon Numemon: Perfect level requirements General The counters (except for battles) are reset when the Digimon evolves

Mokuba Kaiba was tasked with testing it and allowed the player to Duel it as often as he desired