UUD, Plains, Lightwalker, Map the Wastes bolstering Lightwalker, get a Swamp, Outlast Mer-Ek Nightblade, done.
Spidey: 21
Hand: 2
Library: 47
Battlefield:
(U,U) Forest x2
(U,U,U) Plains x3
(U) Blossoming Sands (~ ETB tapped.; When ~ ETB, I gain 1 life,; T: Add G or W to my mana pool)
Pacifism (Enchanted creature can't attack or block)
(U) Honored Hierarch (2/2 from ctr; Renown 1; As long as ~ is renowned, it has vigilance and "T: Add one mana of any color to my mana pool".) *1 +1/+1 ctr* *RENOWNED*
(U) Valeron Wardens (1/3; Renown 2; Whenever a creature I control becomes renowned, draw a card)
(U) Seeker of the Way (2/2; Prowess; Whenever I cast a noncreature spell, ~ gains lifelink ueot)
Graveyard: Titanic Growth, Evolving Wilds
Exile:
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Oversoul: 20
Hand: 1
Library: 46
Battlefield:
(T,T,T) Plains x3
(T,T) Swamp x2
(T) Forest
(T) Jungle Hollow (~ etb tapped. When ~ etb, I gain 1 life. T: add B or G to my mana pool.)
(U) Disowned Ancestor (2/6; Outlast 1B.) *2 +1/+1 counters* *Deathtouch from Mer-Ek Nightblade*
(T) Mer-Ek Nightblade (5/6; Outlast B. Each creature I control with a +1/+1 counter on it has deathtouch.) *Pacified* *3 +1/+1 counters* *Deathtouch from itself*
(S) Lightwalker (3/2; ~ has flying as long as it has a +1/+1 counter on it.) *1 +1/+1 counter* *Deathtouch from Mer-Ek Nightblade* *Flying from itself*
Graveyard: Abzan Falconer, Scale Blessing, Map the Wastes
Exile: