Since some sacrifice outlets sacrifice artifacts in addition to or instead of creatures, you can use cards like Experimental Synthesizer and Treasure tokens for a similar effect
While this usually works out to be between 4 and 6 cards, if you play fewer creatures, dont be afraid to add more board wipes to keep more creature-heavy decks off your back when needed
The Charizard Pokmon card that is worth the most is typically a mint condition 1st Edition from the base set
That means that if they can't make you a strong offer, they'll refer you to the stores that can so that you can make an informed decision, rather than trying to lowball you in hopes that you'll cave
However, time may be on Koraidon's side if it's already commanding decently high prices like these so soon after its debut, it might just rise in the ranks as this card becomes harder to find
Dust flying into your card savers right before submission will possibly hurt your grade