The tiniest bit of whitening or softness on one corner, the kind you'd never notice just holding the card, can knock you down to a PSA 9
Relying on the Zodiac Beast engine to have a stronger starting field and the capacity to lead to explosive plays, the Speedroid engine is utilised to its maximum extent, an improvement from the previous Speedroid Monarch deck builds that merely used the engine to clear threats with Rank3s like and The Phantom Knights of Break Sword
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So start with some low-cost illustration rare cards, and take mental notes (or even physical notes) of the grades and defects you may or may not have seen during pre-grading
#20 Wait, did Grimsley not get a SAR?
A lot of them are 3 mana and in my experience, getting stuck on two lands with a bunch of 3 mana rocks in hand feels super bad