In the case of Chansey, tacking 120 hit points on a basic Pokemon (not an evolution one) meant that this card could be abused in the Damage Swap deck archetype that was dominant during Base Sets heyday (more on that later)
Like most Pokmon cards, the value of Psyduck depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Astral Radiance)
Its dynamic and lively, with a color palette that plays off of the character design perfectly
At the beginning of your upkeep, you may pay
Mobilize Creatures with Mobilize will have a number associated with them, like 2 in Voice of Victory, and when that creature attacks, you make two tapped and attacking 1/1 red Warrior creature tokens