The Double Rare Greninja ex is the cheapest, selling for around $2.50 on average
I like both modes here equally
You can also get creative with alternate attackers such as Raichu, Electrode, and Zebstrika, which will also contribute toward getting that extra damage for Pikachu exs Circle Circuit
They are vulnerable to removal of crew, or artifacts, and they don't come back easily from board wipes, unlike the mass card flow of Enchantresses or the versatility of equipment
Mana is the most important resource in the game, even moreso than your life total or the cards in your hand
We chose this card for its bulk, attack power, and Regi Charge move that helps it reach its energy requirements quickly