On creatures, I think 4 is as few as you can run for the Ichorid matchup. They goldfish faster than you, and your removal power really lacks against Ichorids. Obviously you can keep their Narcomoebas off the table, but they will just use Ichorids for the combo. You can race Ichorid beats, but you can't beat the combo.

I prefer Fanatics over Maruaders.