One interesting thing about Isshin is that lots of Mardu cards have an attack trigger that says untap your other creatures and theres an additional attack phase. This is an excellent trigger to double, granting you multiple combat steps and potentially killing an opponent or two
Seeing an opportunity with the return of Sarkhan Vol to Tarkir, the two are now at least temporarily allied as they work to bring about another movement like the Khanfall
Returning Keyword Ability: Flashback Flashback is a returning mechanic that gives instant and sorcery cards a second chance to have an impact
Released originally in 2009, Planechase cards are large, horizontal, oversized cards that give a static effect to the state of the game board
Not only can it generate tokens, it also allows you to give one of your creatures a big buff once youve created a lot of creatures
I dont think that will stop this from becoming a popular inclusion in Dragon decks helmed by commanders such as The Ur-Dragon or Miirym, Sentinel Wyrm