Possibly as a SB answer in some decks for Bogle and Geist that don't have access to Lilly or would run Supreme Verdict. But the list for Multicolor cards that are hard to answer in Modern are short and most of the decks that would run Renounce the Guilds would run Supreme Verdict or Lilly anyways.
If it becomes an issue, there are ways we can adapt around it. Such as running a number of Favor of the Overbeing or bringing in Gaddock Teeg from the SB.
Interesting, however I fail to see how warping the mana base in a 20 land deck wouldn't change consistency any. Boros Charm won't win the game any faster because the best line of play is still: T1 Bogle, T2 Enchant, Enchant, T3 Coronet/Spirit Mantle. Sure you could draw nut and go: T1 Stomping Ground - Bogle, T2 Mesa fetch Foundry - Rancor - Ethereal Armor swing 5, T3 - Rancor/Ethereal Armor - Boros Charm win. But if you're mulling to 4 on a regular basis due to mana and creature issues, you will need to pull top decks to get that line of play on a mull to 4 or 5. It's worth mentioning Charm is only good with Rancor or Spirit Mantle as the deck can already give First Strike fairly easy and a suited up Bogle is rarely out matched in power and toughness.
Also, with only 2 green fetches you'll rarely be able to pull a Dryad Arbor in the face of an edict and with 3 lands that don't tap for green on turn 1 you're looking to mull more often. Not to mention you lose all hope of recovering from a turn 4 Supreme Verdict on the draw with only 8/9 creatures in the deck. Or even worse, a turn 2 Lilly on the draw....
It just seems to add more problems than it solves...
What's also nice about the charm is the fact that it can give your enchantments indestructibility. It protects you from Maelstrom Pulse and any other enchantment hate they sided in. Losing the coronet is never a good thing and it can protect it.
It's not often that I've had to go down to four cards. I do see your concern with a turn 2 Lilly though, it might be wise to turn a Horizon Canopy into another green fetch as a safety measure.
Interesting charm tech. Its double strike mode is much more live in this deck than most. How has your mana been though? I end up with mana problems running straight 2 colors as it is.
Also running 8 creatures feels like more of a gamble than I'd like to take. I'd prefer at least 11.
The mana has been fine for me. As long as you can produce the double white and have access to red and green you're fine (temple and foundry solves this). Keen sense, canopy, and fetch lands ensure this.
I'm running eight creatures because this deck is meant to mulligan aggressively and I found that whenever I drew the ledgewalker or the spirit dancer they sat in my hand while bogle or scout did all the work. I feel that 11 creatures will give you a dead draw instead of another enchantment (or in my build) boros charm that wins you the game. You can't be afraid to go down to a four card hand, the deck can handle it.
What's also nice about the charm is the fact that it can give your enchantments indestructibility. It protects you from Maelstrom Pulse and any other enchantment hate they sided in. Losing the coronet is never a good thing and it can protect it.
It's not often that I've had to go down to four cards. I do see your concern with a turn 2 Lilly though, it might be wise to turn a Horizon Canopy into another green fetch as a safety measure.
The mana has been fine for me. As long as you can produce the double white and have access to red and green you're fine (temple and foundry solves this). Keen sense, canopy, and fetch lands ensure this.
I'm running eight creatures because this deck is meant to mulligan aggressively and I found that whenever I drew the ledgewalker or the spirit dancer they sat in my hand while bogle or scout did all the work. I feel that 11 creatures will give you a dead draw instead of another enchantment (or in my build) boros charm that wins you the game. You can't be afraid to go down to a four card hand, the deck can handle it.
4x Gladcover Scout
4x Slippery Bogle
Enchantments
4x Daybreak Coronet
4x Rancor
4x Hyena Umbra
4x Spirit Mantle
4x Ethereal Armor
3x Keen Sense
2x Spider Umbra
Instants
4x Path to Exile
3x Boros Charm
3x Temple Garden
1x Sacred Foundry
1x Stomping Ground
3x Razorverge Thicket
4x Horizon Canopy
4x Arid Mesa
2x Verdant Catacombs
1x Plains
1x Dryad Arbor
3x Stony Silence
4x Leyline of Sanctity
2x Suppression Field
2x Gaddock Teeg
2x Torpor Orb
2x Nature's Claim