It also makes these cards easier to cast, which is important in preconstructed decks working with a very restrictive mana base
Be careful not to confuse it with the FDN "Zombie" pack
Slither Wing's first attack is mainly used to stall and disrupt the opponent, as it discards the top card of the opponent's deck, which is useful when dealing with cards like Ciphermaniac's Codebreaking that can place specific cards on the top of the deck
Trap Essence is a bit narrow compared to other counter spells, it only stops creature spells, but it then puts two +1/+1 counters on a creature
Summary Special Illustration Rare cards are the crown jewels of Pokemon TCG due to their stunning art styles and high value
Ultimately, Ive found steel to be fairly metagame dependent working well as a supporting ink, but tends to fall flat in the starring role