Possible Turn 2 Infinite mana (Modern)

This is a more expensive idea with turn 2 possibility.

Except it relies on more luck and hope then anything.
Turn 1 you need at least paradise mental + mox opal + a blue or red land + training Grounds or mass hysteria.
Turn 2- darksteel citadel or other land with a zero drop artifact, this turns on opal with 2 land open. Use darksteel citadel and opal to cast pili-pala then use your last mana to cast mass hysteria. Then you exile simian spirit guide and equip pili-pala with paradise Mantle, then combo is built and you have infinite mana. Down fall with this version you still have to draw one of your x cast spells to get a win condition. Opening hand has to have darksteel citadel + mox opal + any other land + paradise Mantle + training Grounds + mass hysteria + pili-pala then draw a spirit guide. If on the play

So the main part of this deck is three cards that make the main combo that makes everything else easier to cast. Those cards are in ideal conditions would be...
Turn1
Paradise Mantle for 0
Island or blue mana
And a training Grounds
Turn 2
Any mana soruce
Pili-pala
Turn 3
Equip paradise mantle to pili-pala
Then tap pili-pale to add blue mana to you pool, then training grounds will make pili-pala ability cost 1 mana and untapping itself. Thus adding 1 mana of any color to your pool. Then you repeat this process, when you tap again add mana to your pool it will be 2 in pool then spend one to untap and gain another mana giving you 2 mana floating then repeat to add to 3 mana. Then repeat tell you have infinite of any color mana you need, to hopefully cast any x cast spell in you hand. Then comes the rest of the cards in the deck, which are just fun cards I find fun to play at infinite mana. With jeski colors.
Banefire just kills your opponent
Hateflayer + paradise mantle with training Grounds in play means you can blast 5 damage nonstop.
Umbral Mantle + ornithopter + paradise Mantle + training grounds gets you an infinite sized ornithopter.
Sideboard would be what every you need to take out other decks.
As a side note you can just make it 2 color and use mostly basic lands to save some money.