Untap, upkeep, Draw, attack with the Knight for 2, Swamp, Done.
Spiderman: 19
Hand: 4
Library: 49
In Play:
(U) Underground Sea (B/U Dual)
(U) Underground River (B/U Pain)
(U) Island
(U,U) Swamp x2
(T) Black Knight (2/2, first strike, pro white)
(U) Wall of Tears (0/4, defender, whenever ~...