This deck is taken from Zanananan's list and I thought I'd write a quick guide here since the combo is a little complex. If you're familiar with APM Priest then you should have a good handle on how these kinds of deck works.

They key cards for the combo are Floop's Glorious Gloop, Flobbidinous Floop, Pounce, [Hearthstone Card (Elise, the Enlightened) Not Found], and BEEEES!!!. If you're going the full combo these should be the only cards you have in hand otherwise you'll run into space issues. The combo works like so:

Step 1

Play [Hearthstone Card (Elise, the Enlightened) Not Found]. Then play both copies of Floop's Glorious Gloop. Play BEEEES!!! targeting Elise and now you have 8 mana since the Gloop effect stacks.

Step 2

Play Flobbidinous Floop (which is now a copy of Elise) and play BEEEES!!! targeting the Flooped Elise. Then play Pounce. If you followed both of these steps exactly your hand should be: 3x Pounce, 2x Flobbidinous Floop, 1x BEEEES!!!.

Step 3

This step you can repeat as many times as you can if you need to deal more than 30 damage.

Play Flobbidinous Floop then target it with BEEEES!!!. Then play 3 copies of Pounce. This will leave you with the same hand you ended with in Step 2. Again, you can repeat this step as many times as you need to take care of Warriors or just for some sweet BM.

Step 4

Play Flobbidinous Floop then target it with BEEEES!!!. Then play 2 copies of Pounce and use your remaining BEEEES!!! card on your original [Hearthstone Card (Elise, the Enlightened) Not Found]. This should leave you with exactly 8 mana.

Step 5

Play Flobbidinous Floop and 4 copies of Pounce.

Step 6

Play Flobbidinous Floop and 8 copies of Pounce.

If you follow Steps 1, 2, 4, 5, 6 that gives you exactly 30 damage. You could just repeat Step 3 for the same damage but it's a bit quicker to end on steps 4-6. 

Matchups

Against most decks, your main win condition will actually be copying Zephrys the Great. Pulling off the infinite mana combo, play a few copies of [Hearthstone Card (Elise, the Enlightened) Not Found], filling your hand with Zephrys the Great, is often enough to win in most cases.