Of the 71 brand new legends in the set, 40 are mono-colored partners (plus the Piper), with the other 30 being non-Partner multicolor legends
For those, I'm interested in these cards: Living Death Trash for Treasure Reanimate From Under the Floorboards Ox of Agonas Seasoned Pyromancer Feldon of the Third Path Removal When youre done with your synergy list you can move to search for ways to protect yourself from being killed
There are a ton of other broken things the deck can do with multiples of the same Legendary Creatures, but your Commander is going to be the most broken
$100 Inti Doubling the budget lets us snag incredible staples like Professional Face-Breaker and Sword of Forge and Frontier which both ramp and work well with our cast from exile theme, Seize the Day which finishes games and can be discarded early to still be flashbacked later, and one of my favorite cards these days Price of Progress to insta-kill greedy opponents for just 2 mana
If you don't have them already, I'd snag the ones under $10 while they are still cheap