Modern is characterized by hyper efficient aggro and midrange decks. There are only really two ramp decks with consistently strong performances: either Urza Tron decks or Valakut, the Molten Pinnacle decks. Occasionally, we see people trying to leverage the Arbor Elf and Utopia Sprawl combination, but never quite like this:

Four-Color Ramp - Modern | UMEBOSHIJIISAN, 5-0 Modern League

• Creatures (27)
• 1 Craterhoof Behemoth
• 1 Elderscale Wurm
• 1 Eternal Witness
• 1 Hornet Queen
• 1 Primeval Titan
• 1 Wilt-Leaf Liege
• 2 Birds of Paradise
• 2 Courser of Kruphix
• 2 Knight of the Reliquary
• 2 Polukranos, World Eater
• 2 Scavenging Ooze
• 2 Tireless Tracker
• 2 Voyaging Satyr
• 3 Voice of Resurgence
• 4 Arbor Elf

• Planeswalkers (3)
• 3 Kiora, Master of the Depths

• Instants (3)
• 3 Summoner's Pact

• Enchantments (6)
• 2 Overgrowth
• 4 Utopia Sprawl

• Lands (21)
• 5 Forest
• 1 Breeding Pool
• 1 Ghost Quarter
• 1 Kessig Wolf Run
• 1 Raging Ravine
• 1 Stomping Ground
• 1 Temple Garden
• 2 Nykthos, Shrine to Nyx
• 4 Windswept Heath
• 4 Wooded Foothills

• Sideboard (15)
• 1 Gaddock Teeg
• 1 Qasali Pridemage
• 1 Reclamation Sage
• 1 Ruric Thar, the Unbowed
• 1 Scavenging Ooze
• 1 Stony Silence
• 2 Thought-Knot Seer
• 2 Unified Will
• 1 Voice of Resurgence
• 4 Worship

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A bunch of singleton creatures backed up by Summoner's Pact means that you have the ability to find key creatures for particular matchups, such as Wilt-Leaf Liege against discard effects or Hornet Queen against creature decks. You can even find Primeval Titan and get yourself a Kessig Wolf Run or other utility land.

One of the key powerhouses in this deck is Tireless Tracker. You can ramp it out early and the mana engine in this deck means that you'll be able to crack all the clues you can generate, unlike some other midrange decks which can struggle to find opportunities to actually leverage their extra clues.

All in all, this seems like an exciting, flexible deck. Using Kiora over Garruk Wildspeaker lets you untap your Arbor Elves and generate even more mana than other variations of this deck. Some variations play cards like Primal Command to loop with Eternal Witness, or even Collected Company to make the Tireless Tracker plan more consistent. This deck is more about setting up an early Craterhoof, which makes you better at racing combo decks, but somewhat worse at trying to value your opponent's out.

Regardless, if you want a big mana deck that doesn't rely on Valakut or Urza's Tower, this seems like a fantastic choice that walks the line between a ramp deck and a toolbox creature deck. In a format like Modern where high impact singletons can change everything about a given matchup, that seems like a good place to be.