Both Scrooge McDuck, Uncle Moneybags and Scrooge McDuck, Richest Duck in the World can help you play items for a discount or even for free, and if your opponent manages to destroy it, Gyro Gearloose, Gadget Expert can let you put it back on top of your deck to be played again
Bumbleflower, leader of Peace Offering, a Bant Group Hug deck that lets other people draw cards when you cast spells
That said, if your plan is to run the likes of Thought Nibbler it may be a cute combo to assemble to annoy your opponents
Tarkir: Dragonstorm puts Special Guests into 7% of collector boosters with just a 1% chance for a dragonscale foil, and 1.5% of play boosters as a non-foil
Plane - The Abyss Towashi Modified creatures you control have trample and "Whenever this creature deals combat damage to a player or planeswalker, draw a card." (Equipment, Auras you control, and counters are modifications.) Whenever chaos ensues, distribute three +1/+1 counters among one, two, or three target creatures you control
