The company handed out a limited number of these cards to employees as part of his 60th birthday celebration in 2017
For example, Modern Neoform decks, like this list GriselSram used to Top 4 a Modern Challenge on MTGO, cast Allosaurus Rider for free, then convert it into Ghalta, Stampede Tyrant for a quick win
With a haste enabler, like Lightning Greaves, and a way to untap creatures or generate mana on death, like Pitiless Plunderer, you can create an infinite loop of Joo Dees, filling your graveyard with the Surveil trigger
Historically, some Commander groups used the "Partial Paris" mulligan, which allowed players to exile any number of cards from the hand, draw that many minus one, then shuffle the exiled cards back