Planeswalker Challenge - Unbroken (Casual) [Révision 12]

Created for the Planeswalker Challenge - build a deck for any Planeswalker that is thematic, fun to play and accessible.

The simple rules of the challenge:

1. Choose your Planeswalker.
2. Your deck must include 3 copies of that Planeswalker (or, for those that already have theme decks, you can include 1 copy of that Planeswalker and the 2 cards from that deck that tutor that Planeswalker).
3. Your deck cannot include other Mythic cards, and can only include up to 4 Rare and 16 Uncommon.
4. Your deck can only include cards from the same block (or set, post-blocks) as your Planeswalker.

The guidelines for the challenge:

1. Try to create a deck that really shows off what your Planeswalker can do, and that suits their personality.
2. Try to stick to a colour identity that is thematic for your Planeswalker.
3. If your Planeswalker is aligned with a particular faction, try to include only cards from that faction and 'neutral' cards, not cards from other factions.

About this deck:
I wanted to build a deck for Sarkhan Unbroken, one of my favourite Planeswalkers. This obviously meant including a lot of Dragons.
The deck tries to balance the high casting cost of most Dragons by focusing on those with the megamorph mechanic, so that they can fill a lower slot on the mana curve where necessary. Dragonlord's Servants make the Dragons more affordable, and Thunderbreak Regent is dirt cheap.
I used Temur colours in this deck - Blue-Red-Green - to match Sarkhan's colours. Sarkhan at this point is most closely aligned with the Atarka faction, and so I didn't include any cards with the emblems of the other Dragons of Tarkir factions (except actual Dragons). I also didn't use any cards from Khans of Tarkir - those are in a different timeline!
I tried to include as many cards that featured Sarkhan in some fashion as possible.