Ooo, land destruction....
 
Untap, upkeep
 
Swamp
Nighthowler for Bestow on my Harpy
Attack with the Harpy
Responses/blocks?
 
Spidey: 18
Hand: 11
Battlefield:
 
(T,T) Island x2
(T,T) Swamp x2
 
Nighthowler (Bestow 2BB; ~ and enchanted creature get +X/+X, where X is the # of creatures in all graveyards)
 
(U) Felhide Minotaur (2/3)
(T) Blood-Toll Harpy (4/3 from Nighthowler; Flying; When ~ ETB, each player loses a life) *Nighthowled*
 
Graveyard: Sedge Scorpion, Forest
Exile:
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Mooseman: 18
Hand: 11
Battlefield:
 
(T) Plains
(UT) Swamp
(T) Mountain
(T) Forest
 
(U) Cavalry Pegasus (1/1, Flying. Whenever Cavalry Pegasus attacks, each attacking Human gains flying until end of turn.)
(U) Felhide Minotaur (2/3)
 
Graveyard: Voyaging Satyr, Demolish
Exile: