Updated Complete & Utter M&A Guesses Purely for Entertainment Purposes:

$Merck & Co (MRK.US)$ x $Immunovant (IMVT.US)$
$Eli Lilly and Co (LLY.US)$ x $Cytokinetics (CYTK.US)$ (and soon)
$Regeneron Pharmaceuticals (REGN.US)$ x $Apellis Pharmaceuticals (APLS.US)$ (panache & brash)
$Gilead Sciences (GILD.US)$ x % $Madrigal Pharmaceuticals (MDGL.US)$ (liver king)
$Bristol-Myers Squibb (BMY.US)$ x $Iovance Biotherapeutics (IOVA.US)$ (cell Tx boost needed)
$Eli Lilly and Co (LLY.US)$ x $Merus (MRUS.US)$ (partner no more)
$Eli Lilly and Co (LLY.US)$ x $Blueprint Medicines (BPMC.US)$ (just buying all of them)
$Pfizer (PFE.US)$ x $Viking Therapeutics (VKTX.US)$ (acquihigher)
$ROCHE HOLDING AG (RHHBY.US)$ x $Affimed NV (AFMD.US)$ (phoenix)
$AstraZeneca (AZN.US)$ x $Mereo BioPharma (MREO.US)$ (rare)