Ultimate Magic: Holy Many cards in Commander that protect your own permanents from certain doom are format staples, and Ultimate Magic: Holy costs just 1 more than Heroic Intervention
Assign each pile to a different one of those attacking creatures at random
After years of collecting, if we combine both their collections into one super-super-collection, the two of them supposedly own less than half the rares of the set together
Jack-in-the-Mox works in a similar fashionit can backfire 1/6 of the time, but it often makes mana just as well as the average Mox
As far as card recommendations go, Id suggest running the likes of Essence Pulse, Blossoming Bogbeast, and Mortality Spear
#6 Revel in Riches Revel in Riches Secret Lair Drop Series, Rare Treasure tokens are absurdly strong, so anything that uses them to win can only be good