By my count, nine (9) spellbook cards have received some revision to the card mechanics text
BT17-030 SR Digimon Lv.3 Alternative Art Pulsemon Color Yellow Green Cost 3 DP 2000 Digivolve Cost 1 YellowGreen 1 from Lv.2 Form Rookie Attribute Vaccine Type Beastkin/Abadin Electronics Card Text 1 [Special Digivolution Condition] [Digivolve] [Bibimon]: Cost 0 [Effect] [Start of Your Main Phase] By placing 1 [Leon Alexander] from your hand as this Digimon's bottom digivolution card, if you have 3 or more security cards, gain 1 memory
The creatures reflect this, from 1-drops like Figure of Destiny to top-end like Aurelia, the Warleader
It also gives you the versatility of running a full EX deck if you want to, and then you get around things like Sigilyph (LTR 66/113) and Suicune (PLS 20/101) that block your EXs from attacking
You can definitely tell this card was made during Konamis more experimental period early in Yu-Gi-Ohs history
While it has lost a fair portion of its value, Unown V still retains enough demand to cling to the top four spots
