If Ugins Labyrinth is indeed S tier, it will likely be in conjunction with Devourer of Destiny to get up to enough playable 7 drops to consistently get 2 mana off the Labyrinth
Then, we can cast (or reanimate) Loaming Shaman to shuffle 20-ish creatures from our graveyard into our library and win the game on the spot with Syr Konrad, the Grim damage
At four mana, the best use for Razor Pendulum is discarding to Masticore (a fellow four-drop artifact) or sacrificing to Krark-Clan Ironworks (hey look, more four-drops!)
Its one of the main ways to avoid losing the game with Phage, the Untouchable, and it has a lot of cool applications to build around it
These extra slots are negligible to the efficacy of most decks, making play for veterans feel hollow
One Piece 500 Years in the Future card list & price guide