Untap, upkeep, draw.
Swamp.
Attack with Morph creature. (Since you're tapped out, I'm guessing you'll have no responses.)
Ravenous Rats (discard a card).
Boneshredder, targeting your Slinger.
Done.
Turgy22: 18
Hand: 3
Library: 27
Battlefield:
(TTTT) Swamp x4
(T) Seafloor Debris (EtB tapped; T: Add U; T, sac: Add 1 of any color)
(T) Morph (2/2)
(S) Ravenous Rats (1/1; When Ravenous Rats enters the battlefield, target opponent discards a card.)
(S) Boneshredder (1/1; Flying; Echo 2B; When Bone Shredder enters the battlefield, destroy target nonartifact, nonblack creature.)
Graveyard: Phyrexian Rager, Blind Phantasm
Exile:
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Rokapoke: 18
Hand: 4
Library: 28
Battlefield:
(TTT) Mountain x2
(TT) Forest x2
(T) Lowland Basilisk (1/3; Basilisk; Whenever ~ deals damage to a creature, destroy that creature at end of combat.)
Graveyard: Armor of Thorns, Ghitu Slinger
Exile: