Untap, upkeep - sac the Keg to deal 3 dmg to the Adept
Swamp
Outpost Siege, choosing Dragons
Dash the Mardu Scout
Attack with all (the Shadowspear has flying due to the Scout and the Runemark, the Brawler is 3/2 with First strike due to the Scout)
Responses/blocks/take it?
Spidey: 16
Hand: 9
Battlefield:
(T,T) Swamp x2
(T,T) Mt x2
(T) Island
(T) Forest
Jeskai Runemark (Enchanted creature gets +2/+2.; Enchanted creature has flying as long as I control a red or white permanent)
Outpost Siege (As ~ ETB, choose Khans or Dragons.; Khans-At the beginning of my upkeep, exile the top card of my library. Ueot, I may play that card.; Dragons-Whenever a creature I control leaves the battlefield, ~ deals 1 dmg to target creature or player)
(T) Mardu Shadowspear (3/3 from Runemark; Whenever ~ attacks, each opponent loses 1 life; Dash 1B) *Jeskai Runemark*
(T) Battle Brawler (2/2; As long as I control a red or white permanent, ~ gets +1/+0 and has first strike)
(T) Mardu Scout (3/1; Dash 1R)
Graveyard: Goblin Boom Keg
Exile:
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Mooseman: 14
Hand: 11
Battlefield:
(T) Plains
(T) Swamp
(TT) Island
(T) Forest
(T) Aven Skirmisher (1/1, Flying)
(U) Arashin Cleric (1/3, When ~ ETB gain 3 life)
(S) Battle Front Krushok (3/4, ~ can't be blocked by more than one creature. Each creature you control with a +1/+1 counter on it can't be blocked by more than one creature. )
Graveyard: Mistfire Adept
Exile: