I think if you decide to run Swallow's Cowrie as a more budget option to the Primite engine, I would probably recommend bumping Harpist up to 2 or 3 as a good fodder card to tribute, as it gets you your card back end of turn if it gets negated (but at that point you might have already lost if you don't have Channeler)
The dice effect is similar to "Dark Sanctuary", a staple in my "Destiny Board" Deck
With The Lost Caverns of Ixalan, a ton of new, powerful cards are entering into all formats
Today, weve almost endless treatments and variations and it can be hard to keep tabs on which one is the most valuable
Enchanter's Bane Rarity: Rare TYPE: Enchantment SUBTYPE: - CMC: 2 Mana cost: USD: $0.00 EUR: 0.00 TIX: 0.32 EDHREC RANK: 9566 At the beginning of your end step, target enchantment deals damage equal to its mana value to its controller unless that player sacrifices it
The link below will show you why the deck is built the way it is.