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I was playing a green red draft deck last night at FNM. I'm sure that this has been discovered before, but come game three in my first match, I pulled out this combo:

Mana Reflections is on the board.
Pili-pala is there too, though my other creatures are doing most of the work.
I draw a Power of Fire.

I thought about it for a second before I realized that I could equip power of fire, tap Pili-Pala to ping my opponent, and use his untap ability to produce enough mana (via Mana Reflections) to pay for the untap again. Machine gun assembled.

Has anyone else seen this before? I didn't find much about it online.

EDIT: Now that I think about it, you could also Pili-Pala + Mana Relfections + Presence of Gond to make infinite elf tokens.

No rares required, Heritage Druid, Pili-Pala, Presence of Gond, and two other elves. you can also use Mana Reflections with Knacksaw Clique to Utopia Vow to infinitely remove your opponents deck from the game.

It doesn't work, Mana Reflection works only when you tap a permanent for mana, Pili-Pala untaps to produce mana, hence for 2 mana you will net only one.