Nahiri makes the equipment significantly stronger since you always have a creature to equip, and the tokens provide plenty of board presence to protect the planeswalker
Its annoying to be honest, Brandon Troup wrote on Facebook
Other Partner pairings, like Rograkh, Son of Rohgahh and Silas Renn, Seeker Adept, consistently put up strong results at competitive events
IIRC in Yugioh there is only a certain number of Blue-Eyes (from the show?), so you could put a rule on the card 'there may only be X Blue-Eyes on the battlefield at any time', Star Wars CCG used to have permanents that you could have 2 or 3 copies of in play, in addition to stuff you could only have 1 of, the concept would work fine here too, only this could care about both players' boards
Accumulate as much energy as possible, and filter it into your payoffs