Lightning Greaves, Shuko, and Umbral Mantle don't have the more flashy effects (sans Lightning Greaves), but you play them because they can equip to a creature for no mana
You may reveal an Aura card from among them and put it into your hand
Thorncaster Sliver gives all Sliver creatures an ability to deal damage to any target when they attack
English Yellow Cheeks E3 stamped SPOILER: Click to show 600800 165 KB English Ghost/Phantom E ITION 1st edition misprint SPOILER: Click to show 600800 151 KB In this misprint, the 1st edition letters are only partially printed, leaving out the 1st part, and the D in EDITION
But if you Cascade into a card that has the option to counter a spell or have a different effect, such as Cryptic Command, then youre not getting screwed out of the advantage that Cascade provides by getting stuck with a card that you can't play (unless you want to counter your own spell)
In the anime, the former group were also stated to be the first four Numbers to fall to the Earth during Astral's ancient battle with Don Thousand, while the latter is the last Emperor's Key Number to be discovered and obtained
