Untap, upkeep, Urza's Power Plant, Mightstone, attack with the Catapult, responses/blocks?
Spidey: 13
Hand: 0
In Play:
(U,U,U) Swamp x3
(U,U) Forest x2
(U,U,U) Mt x3
(U) Urza's Power Plant
Mightstone (Whenever a creature attacks, it gets +1/+0 while it's attacking)
(U) Rocket Launcher (2...