Yes, I'll tap the other Swamp to use the CoP during your attack.
Untap, upkeep, Draw
Attack for 2
Swamp
Rabid Rats
Done
boogiepop: 16
Hand: 2
Library: 31
Battlefield:
(T,T,U) Forest x3
(T) Mountain x1
Rootwalla (2/2, G1: Rootwalla gets +2/+2 until end of turn. Activate this ability only once each turn.)
Mogg Cannon (T: Target creature you control gets +1/+0 and gains flying until end of turn. Destroy that creature at the beginning of the next end step.)
Graveyard: Stone Rain
Exile:
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Spiderman: 20
Hand: 4
Library: 30
Battlefield:
(T,T,U) Swamp x3
CoP: Green (1: The next time a green source of my choice would deal dmg to me this turn, prevent that dmg)
(T) Dauthi Slayer (2/2; Shadow, ~ attacks each turn if able)
(S) Rabid Rats (1/1; T: Target blocking creature gets -1/-1 ueot)
Graveyard: Plains
Exile: