Five colour Niv-Mizzet Reborn deck. The idea is to ramp with high quality creatures. No one wants to remove Footlight Fiend, yet it boosts the Faeburrow Elder by two (meaning if you have a Faeburrow Elder in play you can cast the Footlight Fiend and net 1 mana). Leyline Prowler is just the best protector, no one wants to attack into a Lifelink Deathtoucher and it fixes my mana. All three creatures can summon Niv together, no need for tapping lands.
You can also switch the Footlight Fiend for the Cindervines, has the same effect.
The rest consists of quality, multicoloured removal to stay alive long enough the beat my opponents to death with my massive dragon. The Chromatic Lantern is there for ramp and premium mana fixing and Golos, Tireless Pilgrim is more or less an alternate win condition, in addition to the ramp and fixing he provides. Getting three free cards off of him can instantly swing the game back in my favour. Finally there's Kaalia, Zenith Seeker who has the same effect on Faeburrow Elder as Footlight Fiend, but a 3/3 Flying, Vigilance for 3 that also digs 6 cards deep for Niv is massive value.
Now, against more control-y decks you can sideboard in 4 Dovin's Veto's for the Tyrant's Scorns, alongside the Ionizes for whatever you want, probably a Kaalia. Shadowspear and Deafening Clarion for aggro decks.
Technically there's an infinite mana combo to make if you include High Alert, who can untap Faeburrow Elder for 4, which can tap again for 5, but it's a pretty fragile and slow combo, so I'm not a fan, but the idea for this deck came from that combo, so it seems only fair to include it. Put in a card like Theater of Horrors and you have a three card combo that can ping your opponent to death. Both Enchantments fix the right colours for the Faeburrow Elder too
