Tap Drownyard Temple to float C. (1 mana floating)
Sacrifice Drownyard Temple to Squandered Resources for C. (2 mana floating)
Create a Plant token with Turntimber Sower.
Sacrifice the Plant to Phyrexian Altar for a mana. (3 mana floating)
Return Drownyard Temple to the battlefield. (0 mana floating)
Add a mana with Lotus Cobra. (1 mana floating)
Go to #2
Those 5 cards on their own don't accomplish anything, but add Omnath, Locus of Rage or Titania, Protector of Argoth for infinite Elemental tokens, add Avenger of Zendikar for infinite +1/+1 counters on my plants (the one created by Turntimber is getting sacrificed each loop, but presumably I'd still have the ones from Avenger), or add Tireless Tracker for infinite clues. Omnath or Titania could replace Lotus Cobra or Turntimber Sower (and Omnath would mean you've got infinite damage), and having three of the four (Omnath, Titania, Cobra, Sower) means you get infinite colored mana. Nissa, Vital Force's emblem makes it infinite (optional!) card draw. The Gitrog Monster makes it infinite (mandatory!) card draw.
Ashnod's Altar could be subbed for Phyrexian Altar to hit infinite mana without a sixth card, but the deck isn't running Ashnod's. And of course, adding other landfall/land death/creature death trigger cards would give the loop other payoffs.
But then my favourite combo in the deck is with Cloudstone Curio, Ruthless Ripper, and another morph card. As long as I have a black card in hand, I can loop the two morphs and flip ruthless ripper infinite times.
8.RG Green Devotion Ramp/Combo 9.UR Draw Triggers 10.WUR Group stalling 11.WUR Voltron Spellslinger 12.WB Sacrificial Shenanigans
13.BR Creatureless Panharmonicon 14.BR Pingers and Eldrazi 15.URG Untapped Cascading
16.Reyhan, last of the Abzan's WUBG +1/+1 Counter Craziness 17.WUBRG Dragons aka Why did I make this?
Building: The Gitrog Monster lands, Glissa the Traitor stax, Muldrotha, the Gravetide Planeswalker Combo, Kydele, Chosen of Kruphix + Sidar Kondo of Jamuraa Clues, and Tribal Scarecrow Planeswalkers
Ashnod's Altar could be subbed for Phyrexian Altar to hit infinite mana without a sixth card, but the deck isn't running Ashnod's. And of course, adding other landfall/land death/creature death trigger cards would give the loop other payoffs.
Two Score, Minus Two or: A Stargate Tail
(Image by totallynotabrony)