Getting me to Mythic this month was Greasefang!
I got a little jammed up at Platinum, but powered through it.

This is a 5 color list I saw somewhere online. I added Sheoldred and messed around with the mana base some.
The Modern Tron adage of 'getting to mulligan' multiple times is true for this deck too. The deck is more consistent to combo by turn 3 than traditional three color Greasefang decks. It struggles against Spirits and is about 50/50 against UW Control. Probably 50/50 against Boros Heroic too.

Deck
1 Liliana of the Veil (DMU) 97
3 Scrapwork Mutt (BRO) 164
1 Guardian of New Benalia (DMU) 19
3 Raffine's Informant (SNC) 26
2 Satyr Wayfinder (BNG) 136
1 Skyclave Apparition (ZNR) 39
4 Greasefang, Okiba Boss (NEO) 220
1 Raffine, Scheming Seer (SNC) 213
1 Grisly Salvage (RTR) 165
4 Thoughtseize (AKR) 127
3 Neoform (WAR) 206
1 Witherbloom Command (STX) 248
2 Can't Stay Away (MID) 213
3 Esika's Chariot (KHM) 169
1 Skysovereign, Consul Flagship (KLR) 272
4 Parhelion II (WAR) 24
2 Adarkar Wastes (DMU) 243
1 Brushland (BRO) 259
1 Llanowar Wastes (BRO) 264
1 Caves of Koilos (DMU) 244
4 Aether Hub (KLR) 279
4 Mana Confluence (JOU) 163
2 Concealed Courtyard (KLR) 282
2 Blooming Marsh (KLR) 280
2 Breeding Pool (RNA) 246
1 Boseiju, Who Endures (NEO) 266
1 Underground River (BRO) 267
1 Sheoldred, the Apocalypse (DMU) 107
1 Botanical Sanctum (KLR) 281
1 Hallowed Fountain (RNA) 251
1 Godless Shrine (RNA) 248