While Pendulum monsters are not necessarily included in the Extra Deck (unless they are also an Xyz, Synchro, Link or Fusion monster), the Extra Deck is also where Pendulum monsters are sent instead of the graveyard
Hed sit an watch an laugh through the whole thing
Gains 200 ATK for each banished card
The biggest problem with the level-up mechanic is that it's slow (and also sorcery speed, which opens it up to blowouts), so having a way to get level counters onto our creatures quicker than normal is essential
Jamon'ishi Suisei Utsukushi-sa Mirokarosu 2 Level 4 WATER monsters During each of your Standby Phases, gain 600 LP
This allows you to draw until you have seven cards in your hand, which is exceptionally helpful when you're in desperate need of energy cards to power up your Pokemon, or for something a lot more specific