This is an infinite mana, infinite life, infinite combat turns, infinite creature power, infinite combat damage, infinite direct damage and infinite landfall combo abusing a new enchantment from Zendikar Rising. Confounding Conundrum is the card this deck is going to abuse to generate infinite life and mana and then generate infinite damage utilizing an always fun card called Goblin Festival.
Here is how it works:
First, Get Fastbond and Grazing Gladehart into play. Optionally have a copy of Goblin Festival in play, in your hand or be holding in your hand any kind of card that can tutor or search up the festival. For now, assume it is in hand or in play.
Then cast Confounding Conundrum, draw your card. Now, anytime your opponent tries to play more than one land they have to bounce a land. This stops any kind of land into play shenanigans they may have.
Then, use a spell like Harmless Offering and give your opponent the copy of Confounding Conundrum you have in play.
Now you can go infinite using Fastbond to put a land into play, then tap it to put mana into your pool. Then play another land using Fastbond and when it comes into play, Confounding Conundrum will make you return a land to your hand. Return the tapped land, then tap the new land, put mana into your pool. The use Fastbond again and put the returned land back into play triggering Confounding Conundrum again.
Repeat this until you have an arbitrarily large amount of life from the Grazing Gladehart as well as an arbitrarily large amount of mana in your pool.
Then, you activate Goblin Festival, then respond to the activation by activating it again. And again, and again, and again until you have an arbitrarily large number of activations of Goblin Festival's ability. Then just let them resolve. When the first activation resolves you may lose control of the festival if you lose the flip. That does not matter because even though your opponent gains control of the festival, they will now have to choose an opponent of yours for each activation because you are the player who activated them!
Moraug, Fury of Akoum is in the deck as an alternate win condition if the festival does not work out. Use the combo to create an arbitrarily large number of landfall triggers of his ability. Then activate Rogue's Passage on any of your creatures. Then make an arbitrarily large number of attacks on your opponents until you win!
There are a huge amount of possibilities and ways to win abusing this combo. I just happened to like the two I put in the deck but you can alter things to suit whatever win conditions you like.
