The plus is great if you want filtering or have creatures, the emblem gets you farther ahead, and the minus three works great with vigilance creatures, which you happen to have
Partner adds an extra wrinkle to the package, effectively allowing you to run two copies of a commander from among the options with partner
The payoff of this meld pair, doesn't win the game on the spot, and I'd stress that to your Bracket 3 playgroup because while this deck puts together powerful cards, it is not optimized to be unbeatable, and more focused on a huge play with some Golgari death and graveyard interaction molded in
If you do, your opponent plays up to 1 Character card with a cost of 4 or less from their hand
Cast spells and draw swords with Legendary Creatures like Gilgamesh, Master-at-Arms and Firion, Swordmaster, or use Summon: Leviathan to control what creatures are on the Battlefield
That's just unfair value