The plot cost makes it far easier to utilize this effect without Railway Brawler being removed first
Smuggler's Copter is banned in Standard, but it's an impressive Vehicle for Commander that filters your hand and stocks your graveyard with goodies to use later
Card Name Mana Cost Type Legendary Creature Wolf Rarity Uncommon rules Text Whenever you cast your first Human creature spell each turn, that creature enters with an additional +1/+1 counter on it for each Dog and/or Wolf you control.: Add one mana of any color
In this specific instance, looking at the 2 cards by themselves, Ariel is better than Gaston, hands down due to her tabletop vaule just being better
If you then cast Sheoldred, the Apocalypse, you will punish opponents' draws while transforming the damage from the draws provided by Gix into life gain, which makes the decision on what should be dealt with harder, for example
However, even with that change, the deck overall is lacking sufficient reliable self-milling engines to really heft up that graveyard