I believe the Ronin is just 4/2.
Dmg on stack, dmg resolves. You take 1, my Ronin and your Avalanchers die.
Island, Honden of Night's Reach, Done.
Spidey: 18
Hand: 11
In Play:
(T) Forest
(T,T) Island x2
(T) Swamp
Honden of Night's Reach (At the beginning of my upkeep, target opponent discards a card for each Shrine I control)
(T) Jukai Messenger (1/1, forestwalk)
(U) Floating-Dream Zubera (1/2, When ~ is put into a graveyard from play, draw a card for each Zubera put into a graveyard from play this turn)
Graveyard: Nezumi Ronin
RFG:
mooseman: 17
Hand: 11
In Play:
(T) Island
(T) Mountain
(T) Forest
(U) Orochi Leafcaller (1/1, {G}: Add one mana of any color to your mana pool)
(T) Battle-Mad Ronin (1/1, Bushido 2 (When this blocks or becomes blocked, it gets +2/+2 until end of turn.) Battle-Mad Ronin attacks each turn if able.)
(S) Soratami Mirror-Guard (3/1, Flying. {2}, Return a land you control to its owner's hand: Target creature with power 2 or less is unblockable this turn.)
Graveyard: Plains, Akki Avalanchers
RFG: