Here's a little concoction with a number of infinite loop combos I'm very fond of, from infinite tokens, to infinite decking, to infinitely large creatures.
There are a couple of engines here. The first is Blowfly Infestation and Flourishing Defenses. Start it up by getting SOMETHING to hit the bin with a -1/-1 counter, which isn't too hard in this deck, and you now have an elf coming in, getting a counter, then dying, which creates another elf ad infinitum. This leads to infinite life off of Essence Warden, infinite decking off of Bitter Ordeal, board wipe off of Grave Pact, and drawing your deck off of Fecundity if you feel the absolute need to get a certain card.
Simply having one Blowfly Infestation and two Flourishing Defenses will net you infinite tokens in a handy manner.
Serrated Arrows, Chainbreaker, Grim Poppet, and Devoted Druid are your enablers, getting counters, facilitating movement and graveyard hits, and providing mana accel. Dusk Urchins also joins that party with card-draw as well.
Kulrath Knight can be your panic button, disabling your opponent's biggest threats with your counter-producers.
Be wary of getting multiple Infestations out, though, because not only can the math kill your brain, but it often leads to ENTIRE board wipes. The stack hates this deck's absurd amount of triggers, so be sure to have your last Blowfly triggers occur before Flourishing Defenses' ones if you wanna keep some tokens when not going infinite.
The sideboard's got Scarscale Ritual for some draw if you need the speed, Quillspike to get gigantic with Devoted Druid, Fate Transfer to act as pseudo-removal and extra card draw/tokens, and Vines of Vastwood if someone decides to be "The Kill Spell Guy."
So, have fun, and any other graveyard-interaction combos in these two colors would be appreciated suggestions! *credit to Scott Johns for inspiration