Given the ease at which Jodah can cast Time Stretch and take two turns on turn five or hard-cast, and get cast-triggers, for the Eldrazi Titans, Jodah will win very soon thereafter
You can push damage earlier with it and some pump effects, and later equip your biggest threat or your commander
The original justification for the banning back in 2011 was that two damage for three mana (thanks to Grove of the Burnwillows forcing the opponent to gain life) was a bit too good, especially against decks featuring small creatures, which Punishing Fire was keeping from the format
Virtue of Persistence Virtue of Persistences adventure is a pretty cheap removal spell and can take out some decent early game threats
You cannot purchase this Secret Lair, they are randomly distributed to attendees of MagicCons so all you can do is attend while feeling particularly lucky
Rishkar's Expertise Rishkar's Expertise has a lot of potential, particularly in decks with bigger creatures