The prime example of this would be a Twin deck that maindecks Dispel, which is effectively a 1 mana hard counter against many Burn spells, but is also useful against tons of other decks when the Twin pilot is protecting their combo
Eldrazi Unbound Commander: My top pick for the most powerful commander precon is Eldrazi Unbuond
Once per turn, if you control no other monsters: You can Special Summon 1 "Noble Knight" monster from your Deck in Defense Position, except "Noble Knight Medraut", and if you do, destroy 1 Equip Spell you control
She'll be translated to MTG as a five-colour Legendary Creature, that can pull five dragon cards out of your deck, into your hand
If you visit a Pokemon League on their scheduled day, oftentimes, the organizer in charge of the event will help you set up any necessary accounts or paperwork in order to begin playing in the Pokemon League and other events
UNDERSTANDING EISENHORN Im not trying to argue that their ever-expanding rules text makes new commanders worse, or even worse for the format