Despite powerhouses like a resolved Unchained Soul Lord of Yama or Unchained Soul of Sharvara, the deck is considerably balanced as it takes a great player to know which specific cards to activate and a good opponent to understand how to bait or work through those cards for a solid game
One key card for any Bobbleheads-themed deck is Kaladesh s Saheeli Rai
The mangas popularity saw the swift production of two anime series
These cards are all meta, with Magby seeing play in the Ho-Oh Ex and Lugia Ex deck, Hitmontop being basically a Fighting-type Pheromosa with more HP, Zubat offering a Poison effect on its attack, Silver manipulating the opponent's cards in hand, Steel Apron being fantastic in Solgaleo Ex decks, and Dark Pendant being a passive form of discard in Darkness decks
Its hard to quantify an answer to that question, but Id guess that Gray Merchant of Asphodel is in the top five black game-enders ever
Imagine combining [mtg_card]Skullclamp[/mtg_card] with [mtg_card]Bitterblossom[/mtg_card], or any other card that can create a lot of 1/1 creatures