Creatures (14)
4x Ninja of the Deep Hours
3x Bloodfire Dwarf
3x Mox Monkey
2x Grim Lavamancer
2x Magus of the Moon
Spells (26)
4x Force of Will
4x Brainstorm
4x Fire/Ice
4x Chalice of the Void
2x Echoing Truth
2x Stifle/REB (not sure witch one I like best yet)
2x Null Rod
2x Back to Basic
1x Time Walk
1x Ansectral Recall
Mana (20)
4x Volcanic Island
3x Blue Fetch Land
3x Red Fetch Land
3x Mountain
5x Island
1x Mox Ruby
1x Mox Sapphire
I like the concept of this deck. Blood moon has a very powerful effect on the game state, especially for a fish deck. Some suggestions though
1) Back to Basics just isn't very good these days, blood moon is actually better. The reason is because many decks can win all in one swoop only tapping their lands once. Also, they can play around Back to Basics by fetching out basic islands like they should be doing vs. fish. Blood Moon on the other hand stops spells from being played and shuts down fetchlands from finding further blue or black mana. (+2 free space)
2) 2 Null Rod + 4 Chalice + 3 Monkey just doesn't look right. I'd go with a 4 Monkey + 3 Chalice plan and then cut out the rods completely. Also, its important to note that a chalice @1 will likely hurt you as much as your opponent. (+2 free space)
3) 4 Fire/Ice seems a bit much. I understand that you've got lots of UW fish on the mind, but I think you are over doing it a little bit. I'd cut 1 for sure. (+1 free space)
4) Now that B2B is gone, you can clean up some things in the manabase. Wasteland is really good in fish, you definitely should try to fit in a few. I also think Lotus should get in the list. I inclined to think that with UW fish being a concern that you should run about 22 mana sources so I'd suggest
2 Mox
1 Lotus
2 Off-color mox (these will really help you having great turn 2's and 3's, trust me)
1 Strip
2 Waste
4 Volcanic
3 Island
4 Delta
3 Strand
So after the mana boost, I'd probably use the remaining 3 spaces to put in some stifles/Reb and another magus or two. I hope this helps.