Untap, Upkeep, Attack with Crusher.
Spidey: 14
Hand: 7
In Play:
(U) Island
(T,T) Swamp x2
(U,U) Forest x2
(U,U,U) Mt x3
Seal of Doom (Sac ~: Destroy target nonblack creature. It can't be regened)
(U) Trickster Mage (1/1, U, T, discard a card: I may tap or untap target artifact, creature, or...