• Damaging instants/sorceries that let you split up the damage. You target your creature for 1, and the rest on the opponent or opponent's creatures.
• Creatures that do something when they're targetted.
• Other instants/sorceries that let you split up the effect, like "tap X creatures".
I didn't research Feather decks at all; this deck could be missing some obvious (commonly played) synergy with Feather. I was just going for the above themes.
Click here for a text version of this decklist
Click here for my EDH Commander decks