Though only 28 examples have achieved that grade, PSA has only graded 382 overall, meaning that roughly 7% of them are PSA 10s
They are, as originally stated, "not designed to be a substitute for building a collection, nor is it designed for building a deck from scratch"
As a huge fan of such art, these three cards are what I am going to be looking forward to collecting personally
Centering must be 85/15 or better on the front and 90/10 or better on the back, PSA 4 / Very-Good-Excellent (VG-EX): Here the corner damage, printing defects or surface wear may be more pronounced and can even include faint creases
Of course, if you can use the mana better, you can change the symmetric effect to your advantage, and theres a chance there were decks that could do just this
Madness keeps an opponent second-guessing your moves, lets you cast powerful spells to cast for cheap, and with a bit of graveyard recovery, can be cast at nearly any time