DropDown M? MAN you're behind the times if your still on MMBN 2. The Popper viruses, Popper 2s I believe drop them in UnderNet 5. Rare encounters. Preset Jealousy.
As for HeatSpread, use a GrassStage beforehand, and a CopyDamage if you must. The chips are..
HeatShot H,I,J or Heat-V I,J,K or HeatSide J,K,L or HeatShot J, Heat-V J, and HeatSide J