To help close out games, you can give cards with powerful effects storm to close out the game such as Lightning Bolt to deal a ton of burn damage or Ice Storm to destroy your opponents' lands
One last note, going forward I will be referring to all of these partner-like mechanics as partner
At the beginning of your upkeep, if there are fourteen or more cards in all graveyards, transform CARDNAME
Summary Thickest in the Thicket doubles a creature's power and lets you draw cards, giving you a powerful advantage in the game
Thanks to potentially creating an army of Spirit tokens for WUBRG, Hei Bai can easily flood the board and overwhelm opponents
It revolves around a central Commander that helms your deck, giving it a ton of personality as players gravitate towards their favorite legendary creatures to build around