Heh, looks like we have a couple of game board mistakes. Technically you don't have a Plains free, but I'll assume you wanted it to be free after you cast Frogmite. In turn, my AEther Spellbomb only needs U for its first ability, not 1, U - so in response, I'll tap my Island and use my Spellbomb to save my Giant.
In which case I'm done
Spidey: 18
Hand: 10
Battlefield:
(T,T) Forest x2
(T) Island
(T,T) Mt x2
(T) Swamp
(U) Bonesplitter (Equipped creature gets +2/+0.; Equip 1)
(U) Marsh Flitter (1/1; Flying; When ~ ETB, put two 1/1 black Goblin Rogue creature tokens onto the battlefield.; Sacrifice a Goblin: Marsh Flitter becomes 3/3 until end of turn.)
(U) Goblin Rogue creature token (1/1)
(U) Goblin Rogue creature token (1/1)
(T) Blind-Spot Giant (6/3 from Bonesplitter; ~ can't attack or block unless I control another Giant) *Equipped w/Bonesplitter*
Graveyard: Search for Tomorrow, AEther Spellbomb
Exile:
========================================================
Mooseman: 20
Hand: 9
Battlefield:
(T) Plains
(T) Swamp
(T) Mountain
(TT) Forest x2
(U) Arcbound Worker (1/1, Modular 1 (This comes into play with a +1/+1 counter on it. When it's put into a graveyard, you may put its +1/+1 counters on target artifact creature.) )
(U) Thalid Shell-Dweller (0/5, Defender At the beginning of your upkeep, put a spore counter on ~. Remove three spore counters from ~: Put a 1/1 green Saproling creature token into play. )21 spr cntr~
(U) Amrou Scout (2/1, 4, T: Search your library for a Rebel card with converted mana cost 3 or less and put it into play. Then shuffle your library.)
(S) Penumbra Spider (2/4, Reach. When ~ dies, put a 2/4 black Spider creature token with reach onto the battlefield. )
(S) Frogmite (242 Affinity for Artifacts)
Graveyard: Lightning Helix
Exile: