Power Depot and Urzas Saga both being vulnerable to Disenchants is another reason to play more lands and something to keep in mind when planning your sequencing
2013: Young Pyromancer Ravnicas return continued apace, with the Extort-tastic Gatecrash and the letdown that was the final set
They compete directly with Ayara's recast, so for every 5-drop we kind of have to ask ourselves, "Would Ayara rather I cast this or put her back on the battlefield?" With that in mind, shifting as many of our 5-drops as possible to "similar" 4-drops (or maybe even up to 6-drops) would be A Good Thing for Ayara (and so almost certainly a good thing for the deck)
Red gives you access to spells like the old-school Fireball or the much better Comet Storm
Sample Decklist This decklist is intended for Bracket 3 (Optimized), but it does include one incidental infinite combo
The Reaper, King No More The original Reaper King is a Scarecrow lord, but his retired version is a Jund value engine