card slab sleeves Graded (PSA/TAG/CGC) or prepared for resale Cardboard Gold PSA Graded Card

The second reason is that Dragon Ruler used to win against Spellbook

This card has the words limited edition printed on the bottom left of the card art box

Come to think of it, if I remember right, the only field spell the game doesn't have a duel start on is the Meadow field

Kaiju Capture Mission X TRAP Continuous Once per turn, if there are less than 3 Kaiju Counters on this card: You can target 1 "Kaiju" monster on the field

GX episode 33: "Field of Screams, Part 3", Chazz referred to this card as Camula's "killer card", after the latter Summoned it

They are somewhat rarer than Commons but rarely increase in value beyond a few cents