I think the life is right. From post #37, before your turn, it was 21. Then in post #38, I gained 2 life from your CU to 23 but lost 4 from the attack, so down to 19. Then in your last post #40, I gained 3 from CU to 23 but lost 4 from the attack down to 18, right? But your Hulk should have an age ctr on it as well.
Untap, upkeep - age ctr, pay CU
Plains
Done
Spidey: 18
Hand: 7
Battlefield:
(T,U) Forest x2
(T,U) Plains x2
(T) Mt
(U) Swamp
(T) SC Island
(U) SC Mt
Surging Might (Enchanted creature get +2/+2; Ripple 4)
(U) Boreal Druid (Snow Creature-Elf Druid; 1/1; T: Add 1 to my mana pool)
(U) Phyrexian Ironfoot (3/4; ~ doesn't untap during my untap step.; 1S: Untap ~ (S can be paid with one mana from a snow permanent))
(U) Juniper Order Ranger (5/7 from ctrs; Whenever another creature ETB under my control, put a +1/+1 ctr on that creature and a +1/+1 ctr on ~) *3 +1/+1 ctr*
(U) Ronom Hulk (8/9 from ctr and Mighty; Protection from snow; Cumulative upkeep 1) *4 age ctr* *Mighty*
(U) Ronom Serpent (Snow Creature-Serpent; 6/7 from ctr; ~ can't attack unless defending player controls a snow land.; When I control no snow lands, sac ~) *1 +1/+1 ctr*
(U)Rimewind Taskmage (2/3 from ctr; 1, T: Tap or untap target permanent. Play this ability only if I control four or more snow permanents) *1 +1/+1 ctr*
Graveyard: Frost Raptor
Exile:
=====================================================================
Mooseman: 17
Hand: 7
Battlefield:
(UT) SC - Palins
(T) Swamp
(T) Island
(T) Mountain
(UTT) SC-Forest
(U) Boreal Centaur (Snow Creature; 2/2 Snow: Boreal Centaur gets +1/+1 until end of turn. Activate this ability only once each turn. (Snow can be paid with one mana from a snow permanent.))
(U) Wall of Shards (Snow Creature; 1/8 Defender, flying. Cumulative upkeep—An opponent gains 1 life) ~3 age~
(U) Adarkar Valkyrie (4/5 Snow Creature Flying, vigilance Tap: When target creature other than Adarkar Valkyrie dies this turn, return that card to the battlefield under your control.)
(U) Ronom Hulk (5/6; Protection from snow; Cumulative upkeep 1) *1 age ctr*
(S) Artic Nishoba (6/6 Trample, Cumulative upkeep G or W When Arctic Nishoba dies, you gain 2 life for each age counter on it.)
Graveyard: Martyr of Ashes, Simian Brawler, Martyr of Frost
Exile:
Untap, upkeep - age ctr, pay CU
Plains
Done
Spidey: 18
Hand: 7
Battlefield:
(T,U) Forest x2
(T,U) Plains x2
(T) Mt
(U) Swamp
(T) SC Island
(U) SC Mt
Surging Might (Enchanted creature get +2/+2; Ripple 4)
(U) Boreal Druid (Snow Creature-Elf Druid; 1/1; T: Add 1 to my mana pool)
(U) Phyrexian Ironfoot (3/4; ~ doesn't untap during my untap step.; 1S: Untap ~ (S can be paid with one mana from a snow permanent))
(U) Juniper Order Ranger (5/7 from ctrs; Whenever another creature ETB under my control, put a +1/+1 ctr on that creature and a +1/+1 ctr on ~) *3 +1/+1 ctr*
(U) Ronom Hulk (8/9 from ctr and Mighty; Protection from snow; Cumulative upkeep 1) *4 age ctr* *Mighty*
(U) Ronom Serpent (Snow Creature-Serpent; 6/7 from ctr; ~ can't attack unless defending player controls a snow land.; When I control no snow lands, sac ~) *1 +1/+1 ctr*
(U)Rimewind Taskmage (2/3 from ctr; 1, T: Tap or untap target permanent. Play this ability only if I control four or more snow permanents) *1 +1/+1 ctr*
Graveyard: Frost Raptor
Exile:
=====================================================================
Mooseman: 17
Hand: 7
Battlefield:
(UT) SC - Palins
(T) Swamp
(T) Island
(T) Mountain
(UTT) SC-Forest
(U) Boreal Centaur (Snow Creature; 2/2 Snow: Boreal Centaur gets +1/+1 until end of turn. Activate this ability only once each turn. (Snow can be paid with one mana from a snow permanent.))
(U) Wall of Shards (Snow Creature; 1/8 Defender, flying. Cumulative upkeep—An opponent gains 1 life) ~3 age~
(U) Adarkar Valkyrie (4/5 Snow Creature Flying, vigilance Tap: When target creature other than Adarkar Valkyrie dies this turn, return that card to the battlefield under your control.)
(U) Ronom Hulk (5/6; Protection from snow; Cumulative upkeep 1) *1 age ctr*
(S) Artic Nishoba (6/6 Trample, Cumulative upkeep G or W When Arctic Nishoba dies, you gain 2 life for each age counter on it.)
Graveyard: Martyr of Ashes, Simian Brawler, Martyr of Frost
Exile: