After the first wave of popularity in the late 90s, the market cooled dramatically in the early 2000s
Lets add another card and make things even better! Still, this closes the window you need your planeswalker active for, which is fine
With Dian having 2800 ATK and 3000 DEF, its got the perfect statline to get over most monsters, which would then give the player more options for the next turn, or even push for more damage to get closer to game
As long as you have this, other monsters will not be attacked or targeted by effects, so you can build a strong resistance, but the person himself is resistant only to combat, so he can't use it much
[Main] Delay (By trashing this card after the placing turn, activate the effect.) 1 of your Digimon may digivolve into a purple Digimon card in the hand with the digivolution cost reduced by 2
Single Combat Single Combat is an excellent board wipe for Voltron decks that make a single, large creature