I recently wrote in-depth about Mono Red Aggro and Mono Blue Spirits in Pioneer, as I had good success with both decks in the previous Regional Championships Qualifier season
The best choice for grading is often the card that has the most emotional impact for you
A free Char and two Lightning Bolts directed nearly however you want is great value, and can even be a great way to burn opponents down if they don't have enough creatures to hit
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Kerplunk provides trample to all your creatures, not just Chocobos, so your creatures with naturally high stats become bigger threats