Like most Pokmon cards, the value of Pikachu 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 (SWSH Black Star Promos)
Also - and this is a minor thing thats definitely not going to be abused to bring out chaotic combos at any point - she gives you one Red mana whenever you cast a spell
Here are all of the budget instant speed green card draw spells you can include in your decks: Charge Through Target creature gains trample until end of turn Draw a card Hunters Insight Choose target creature you control Whenever that creature deals combat damage to a player or planeswalker this turn, draw that many cards Inspiring Call Draw a card for each creature you control with a +1/+1 counter on it Those creatures gain indestructible until end of turn Viridescent Wisps Target creature becomes green and gets +1/+0 until end of turn Draw a card Warriors Lesson Until end of turn, up to two target creatures you control each gain Whenever this creature deals combat damage to a player, draw a card Here is a pre-populated list of all of those 2 mana instant speed green card draw spells I was mentioning

Venusaur ex - 198/165 Weekly Spike: +$17.59 Current Market Price: $145.42 Investment Velocity: 77.23% Increase I couldnt mention Charizard and Blastoise and not bring up Venusaur ex (198/165)the objective best Kanto First Partner, right
If purchased from trusted sellers and held long-term, Pokemon cards can offer both enjoyment and potential financial return