For consistent deck building, singles are the most reliable option.
In Vintage and Legacy+ Cubes, Grixis Wheels isn't just a gimmick - it's a strategy
Both the Darkrai EX and Palkia EX decks that are currently in vogue, for instance - supplemented by Cyrus again, who lets you switch a damaged enemy Pokmon of your choice into the active slot - rely on you not being able to heal damage fast enough from multiple members of your team
Further to this, it is still very much a bell curve distribution, making most of them basically as good as each other
Build up your deck and become unstoppable in battle
Lord Jyscal Guado* Bad card draw, is still card draw, and otherwise Lord Jyscal is perfectly alright, while fitting in the Final Fantasy 10 Commander Deck