Help me with the Firesweep Lunge setup...

So I heard this defense setup somewhere in the Q&A and I thought I could use this as my setup.

Micaiah, Lilina, and Ninian all have WoM. Oscar will be my Firesweep/Lunge unit, he will attempt to force any unit to step on the lightning trap, which will both damage the one who fell for it and Oscar himself. Oscar is unmerged, so he has exactly 40 HP, and the trap is level 2 and cut his HP in half. When the trap activates, all WoM activates, leading to Micaiah and Lilina's havoc. Lilina is equipped with Quickened Pulse and Glimmer, and is supported by L!Hector's Ostia's Pulse, making Glimmer ready.