I already had the Sarkhan, the Dragonspeaker, Goblin Rabblemaster,
Stoke the Flames
, Lightning Strike, Magma Jet, Shivan Reef and two of the mid-range priced lands, and although the additional investment hurt a bit I get to try out this colour wedge and see how it goes. Multiple colours means an expensive manabase, but mana tends to retain its value so okies. The sideboard having Brimaz, King of Oreskos means I have an excuse to get some and have them find their way into my older heroic deck, and white Commander decks.
The article that is the source of the deck (Source) speaks a bit about why this Jeskai is built the way it is and how other popular Jeskai decks are currently shaping up.
Just hunting down some material on the cards:
"Looking at the spells, there isn't really too much new here with the exception of
Jeskai Charm
which has 3 modes that are all very valuable and useful depending on the situation. 4 damage to your opponent for 3 mana is already very powerful and something that an aggressive deck is happy to have for the extra added reach. However, sometimes there are situations that arise where the 4 damage isn't enough. Thankfully we have 2 other options.
One of those options is to put a creature on top of its owner's library. This is great if you're looking just to remove a blocker for a turn just to get some damage through with attackers. Also don't forget the Khans of Tarkir brought back fetchlands, and in a pinch you can respond to your opponent cracking their fetch to search for a land by putting a creature on top and their monster gets shuffled away into the randomness of the remaining cards in their library.
Finally we can make all our creatures +1/+1 and gain lifelink. This works great in racing situations against other aggro decks, works great with Goblin Rabblemaster ...
Another spell from the new set that is extremely powerful here is Dig Through Time. In this particular deck we are casting burn spells and trading creatures in the early game constantly. As such, it's not uncommon that our graveyard fills up rather quickly and we're left with only a few spells left in hand. Dig Through Time gives us a perfect tool to fill up the gas tank, and we're able to do so cheaply via the delve mechanic.
There are a few new creatures to talk about as well. Let's start with the two-drop:
Seeker of the Way
. There's no shortage of noncreature spells in our deck to activate the prowess ability, and that combined with the lifelink it gains allows you to start your games off in an explosive, aggressive way while gaining life that gives you the cushion and time you need to finish off your opponent.
The other new creature featured here is
Mantis Rider
. It is exactly what this deck is looking for in a three-drop. A hasty 3-power creature that also flies, and while we're at it we'll add vigilance.
Sarkhan, the Dragonspeaker, while a planeswalker, can fill multiple roles in this deck. Sometimes you'll cast it and immediately -3 loyalty to take out their pesky Courser of Kruphix. Other times, it's attacking for 4 with flying." (Source)
