You can now dump a variety of different extenders into your grave, easily enabling a gigantic combo, or even a First Turn Kill with just one spell card
The reason is because although this deck makes it very difficult for you to summon from that zone, it still isn't impossible, and if this deck were ever to be played competitively (yeah, yeah, I know, but I'm going for realism here xD) having an extra deck, or more importantly at least the illusion thereof is a strategic choice
Shalai, Voice of Plenty Explosive Angles Whilst the best way to guarantee consistency in a game of EDH is to pick a Commander with card advantage or ramp in the command zone, its sometimes not the most flavorful or fun choice
With 151 monsters to make cards out of, all with distinct elemental types plus many items that could be employed as support cards, it would have been foolish of Nintendo and Game Freak not to cobble together a Trading Card Game out of it all