Dice rolling formerly was not part of the official Magic rules for the regular game, but had been used in supplemental sets and was considered for Battle for Zendikar
Ureni also acts as the win condition, though its worth considering land-based win conditions like Dark Depths + Thespian's Stage and Field of the Dead to enhance it
I think Devoted Druid cant maintain the price and if this combo does anything, it will be in a 60 card format with 4 Longbows, 4 Stoneforges, 4 Urzas Sagas, etc
This Khans of Tarkir monk is one of the best early-game attackers in Magic, let alone in red
It plays a bit like Boros commander Feather, the Redeemed in that heres where you might actually sleeve up a Show of Confidence, but in these colors, also cantrips like Leap