Endoplasmic Reticulum

When Endoplasmic Reticulum enters the battlefield, create a green artifact token called
Rough ER that has "{p/g}: Bind target ribosome to
Rough ER", and a green artifact token called
Smooth ER that has "{g}{g}{t}: Create a blue Lipid creature token" and "when Smooth ER is on the battlefield, you cannot be targeted by toxic spells
or abilities
If you control a Nucleus, Endoplasmic Reticulum
gains indestructible