Untap, draw, play Mountain, tap all my lands to play Ball Lightning (RRR for 6/1 trampling haste, dies at end of turn). I'll then attack with all three creatures. Instants?
Spidey: 19
Library: 52
Hand: 4
Play:
(U) Swamp
(U, U) Forestx2
Grave: Diabolic Edict, Dark Banishing, Treetop Village
RFG: --
Oversoul: 19
Library: 48
Hand: 1
Play:
(T, T) Mountainx2
(T) Taiga
(U) Cursed Scroll
(T) Mogg Fanatic (1/1)
(T) Kird Ape (2/3)
(T) Ball Lightning (6/1)
Grave: Wooded Foothills, Kird Ape, Wasteland, Jackal Pup
RFG: --