Level -6, the polluted forest

{t} {b}{b}{3} Transform target creature into a 6/5 Nuclear Membri
{t} {b}{b}{b}{1} Transform target creature into a 0/4 deathtouch skin dissolver
{t} {b}{g} Transform target creature into a 0/2 deathtouch deathfish
{t} {3}{b}{g} Transform target creature into a 5/6 Corrosive Moth with trample
{t} {b}{b}{b}{g}{6}} Transform target creature into a 10/10 Nucleigo with trample, indestructible