Although the format is currently designed to be midrange heavy, there’s probably room for a very fast deck. How many 2/1 for one are there right now? Quite a few.

Supposing we want to be an ultra fast white deck that goes wide, we can use all the one drops available to us:

[deck]
[creatures]
3 Kytheon, Hero of Akros
4 Soldier of the Pantheon
4 Dragon Hunter
4 Mardu Woe-Reaper
4 Loyal Pegasus
4 Selfless Cathar
4 Ajani’s Pridemate
3 Anafenza, Kin-Tree Spirit
3 Hidden Dragonslayer
4 Sightless Brawler
[/creatures]
[spells]
4 Launch the Fleet
[/spells]
[lands]
19 Plains
[/lands]
[/deck]

Sadly, that’s all the one-drops worth their salt. I guess 23 is enough. Some sort of Anthem effect would probably be nice. [scryfall]Spear of Heliod[/scryfall] comes to mind as not all of these share a creature type (so [scryfall]Obelisk of Urd[/scryfall] is out of the question).

If you want to get Gideon going even faster, you can always bring in red for [scryfall]Monastery Swiftspear[/scryfall] and [scryfall]Lightning Berserker[/scryfall], although latter won’t be very good in a two-colored deck.