Archfiend Giant X DARK Level 6 [ FiendEffect ] ATK 2400 DEF 1600 If this face-up card on the field would be destroyed by a card effect, you can pay 500 LP instead
The most common is upgrading your cheap artifact into Blightsteel Colossus although many fat threats get the Tinker treatments from Sphinx of the Steel Wind to Sundering Titan to Myr Battlesphere to Inkwell Leviathan to the comparably small Wurmcoil Engine
The cards available in volume 4 of Promo Series A are: Turtwig Misdreavus Skarmory Electivire Cresselia ex Promo Series A Volume 5 You can earn one pack of Volume 5 every time you beat the Garchomp ex & Gliscor (Triumphant Light) advanced deck from the event battles list
The card is even more popular in lists that use Insect Imitation to easily search out and cheat a LV5 into play
Also, this card can be activated not only from the hand, but also from the field, so it can be teleported, or rather, jumped at the beginning of the opponent's turn
Countering a five or six mana Commander with this feels criminal, and if you can follow it up by dumping your hand into play, well youre in great shape