So just to be clear, I take 4 and the Slingers die.
Untap, upkeep, Draw, attack with the Pyrosaur and Thran War Machine...
Spidey
Life: 7
Cards in Hand: 2
Cards in Play:
(U, U, U, U) Mountainx4
(U, U, U) Islandx3
(T) Pygmy Pyrosaur (1/1, can't block, R: gets +1/+0 until EOT)
(U) Fogbank...