Paradox Sisay (EDH / Commander)

Paradox Combo:
With the printing of Mox Amber, the combo is now even easier to assemble. You will need to have Sisay in play, and be able to produce at least 5 mana, plus a spell (and mana to cast it) to untap with Paradox

Find, cast Paradox Engine, cast any 1-2 mana spell
Find, cast Mox Amber (0)
Add 1 mana (1c)
Find, cast Mox Opal (1c)
Add 2 mana (3c)
Find, cast Seton (0)
Add 3 mana (3c)
Find, cast Rishkar (0) Put counter on Sisay
Add 4 mana (4c)
Find, cast Kataki/Yisan (1c worst case)
Add 4 mana (5c)
Find, cast Skyship Weatherlight (1c), getting Qasali Pridemage/Caustic Caterpillar, Mana Crypt/Sol Ring/Mana Vault, Top (Sisay can now tap for mana)
Add 5 mana (6c) (Use Sisay)
(Find, cast URB if necessary)
Activate Skyship (2c), worst cast get Pridemage
Cast Pridemage (0)
Add 5 mana (5c) (Use Sisay)
Activate Skyship (1c), worst case get Top
Cast Top (0)
Add 5 mana (5c) (Use Sisay)
Activate Skyship (1c), get Sol Ring
Cast Sol Ring (0)
Add 6 mana (4c + 2) (Don't use Sisay)
Find, cast Bow of Nylea (2c + 1)
Add 6 mana (6c + 3) (Don't use Sisay)
Sac Pridemage to kill Skyship (6c + 2)
Use Bow to put Skyship back under (5c + 1)
Find, cast Skyship (2c)
Add 6 mana (6c + 2)
=> You will now have infinite mana and can cast every single creature/artifact in your deck.
Bow can make your Sisay infinitely huge
Top lets you draw your whole deck. You can cast Beast Within an infinite number of times to destroy every permanent.

Azusa line (retired)
Find, cast Paradox Engine, cast any 1-2 mana spell
Add 1 mana (1) <- 1 colorless mana, which is the worst case scenario with Boreal Druid
Find, Cast Mox Amber (1)
Add 2 mana (2 + 1c)
Find, Cast Mox Opal (2 + 1c)
Add 3 mana (3 + 3c)
Find, cast Azor's Gateway (1 + 3c)
Add 3 mana (2 + 5c)
Find, cast Azusa (0 + 4c)
Add 3 mana (1 + 6c)
Find, play Inventor's Fair (1 + 6c)
Sac, search for Thousand-Year Elixir (3c)
Play Elixir (0)
Add 3 mana (1 + 2c)
Find, cast Dosan (0) <- this is to prevent your opponents from messing with you once you start your Selvala chain
Add 3 mana (1 + 2c)
Find, cast Selvala (0)
Add 3-5 mana with Selvala. You can chain a few of these together with the remaining legendary spells in your deck. Combined with Elixir for an additional untap each time, it is almost impossible to fizzle. Keep casting spells and drawings cards until you draw into Green Sun’s Zenith. Now you can repeatedly cast that to prevent yourself from decking while your opponents die from drawing their entire decks. Bow of Nylea also works. You will also at some point be able to just cast Elesh Norn + Living Plane and they should just scoop.

Azor's Gateway Line (retired)
If Selvala is not available, Azor's Gateway is another option. Fetch Azor's Gateway as one of your early legendaries. Start exiling cards of different costs as you untap each time-you can also use Sisay to get the last missing CMCs. Once it flips, you can easily generate a ton of mana. Find, cast Kamahl. Find, cast Elesh Norn. At the bare minimum you should be blowing up 10 lands but often it will be the whole board.

Blasting Station line (retired)
Find, play Inventor's Fair (2 + 5c)
Sac, search for Blasting Station (3c)
Play Blasting Station (0)
Add 3 mana (1 + 2c)
Find, cast Bow of Nylea (0) <- your original colored source must have been G, aka no Avacyn’s Pilgrim + Boreal Druid
Add 3 mana (1 + 2c)
Tap, Sac Hope of Ghirapur to deal 1 damage (1c)
Use Bow of Nylea to put Ghirpur on the bottom of your library
Find, cast Hope of Ghirapur (0)
Rinse and repeat

Curio line: (retired)
As an alternative, you may get Cloudstone Curio instead.
Find, play Inventor's Fair (2 + 5c)
Sac, search for Cloudstone Curio (3c)
Play Curio (0)
Add 3 mana (1 + 2c)
Find, cast Yisan, bounce Kataki (0)
Add 3 mana (1 + 2c)
Play Kataki, bounce Azusa (1c), Search for Okina
Add 3 mana (1 + 3c)
Play Azusa, bounce Kataki (1c), Search for Flagstones, Play Flagstones and Okina
Add 3 mana (1 + 3c)
Play Kataki, bounce Azusa (2c), Search for Miren
Add 3 mana (1 + 4c)
Play Azusa, bounce Kataki (2c), Search for Gemstone Caverns, Play Miren and Gemstone Caverns
Add 3 mana (1 + 4c)
-> This gets you infinite colored mana
-> Play all the legendaries in your deck, Elesh Norn + Kamahl = wipe all lands