Additionally, its effect became even better over time with the introduction of Urzas Saga and the metagame shifting towards more artifact-heavy synergies
For example, even if we interpreted your library as part of the battlefield for this purpose, slipping one into the card sleeve of a card in your library during a search effectively marks your deck, and that's not allowed
The Water deck spearheaded by Articuno EX, Palkia EX, Manaphy, Misty, and Dawn is going to create waves (quite literally)
With its Blizzard attack, it can deal 80 damage to the opponents Active Pokemon and an additional 10 damage to each of their Benched Pokemon
Paying 2 life to have them come in untapped helps you to stay on curve, and in decks like Death's Shadow, that life loss is actually a bonus