Pomalidomide naive disease Prior pomalidomide treatment (for patients on the pomalidomide arm) Prior exposure to pomalidomide Pts who have received prior treatment with pomalidomide (Phase II only) Medically supervised (ie, performed in a clinic) pregnancy testing, including those who commit to true abstinence. Two pregnancy tests must be conducted prior to starting pomalidomide. The first pregnancy test must be performed to days prior to the start of pomalidomide and the second pregnancy test must be performed within hours prior to starting pomalidomide. Females of childbearing potential with regular or no menstrual cycles must also agree to have pregnancy tests weekly for the first days study participation, every days while on study, at study treatment discontinuation, and at Day following pomalidomide discontinuation. If menstrual cycles are irregular, the pregnancy testing must occur weekly for the first days of study participation and then every days while on study, at study treatment discontinuation visit, and at Days and following pomalidomide discontinuation. All male and female subjects must follow all requirements defined in the pomalidomide Pregnancy Prevention Program. Prior exposure to elotuzumab or pomalidomide Any prior use of pomalidomide Prior therapy with pomalidomide History of treatment with venetoclax or another B-Cell Lymphoma (BCL)- inhibitor or pomalidomide. Prior treatment with pomalidomide Prior exposure to pomalidomide or HDAC inhibitors is allowed Patients unable to receive adequate thromboprophylaxis in combination with pomalidomide Patients that have previously progressed on pomalidomide treatment Has received previous therapy with pomalidomide Prior treatment with pomalidomide Has received previous therapy with pomalidomide and did not achieve at least a stable disease May have undergone prior treatment with pomalidomide if patient is not refractory to pomalidomide and has previously achieved a response of MR or better to pomalidomide. Prior therapy with pomalidomide with best response of PD or SD. Must be Pomalidomide nave. Prior therapy with pomalidomide. Patients taking a known moderate to potent inhibitor of CYPA are excluded; pomalidomide is primarily metabolized by CYPA and CYPA; pomalidomide is also a substrate for permeability (P)-glycoprotein (P-gp) Previous treatment with pomalidomide Prior therapy with a combination regimen containing pomalidomide except the drug combination of pomalidomide and dexamethasone Patients who are pomalidomide refractory, defined as patients who progress on or within days of pomalidomide when given as a single agent or with dexamethasone Prior treatment of any duration with pomalidomide Any prior use of thalidomide or pomalidomide Previous therapy with pomalidomide. Prior exposure to pomalidomide for subjects enrolling in the pomalidomide/dexamethasone combination arm. No prior therapy with pomalidomide or everolimus Prior pomalidomide exposure Previous therapy with Pomalidomide A minimum of prior lines of therapy including an IMiD and a PI and is refractory to pomalidomide and/or daratumumab