You may have noticed Tiana, Celebrating Princess is not in either of the decks, despite one copy being included in the deck
Craterhoof with no tutor is a possible kill for eight mana, but a four-mana Craterhoof definitely will kill someone much earlier
Purphoros's abilities function while it's on the battlefield, regardless of whether it's a creature
Take a look at Scrubland and compare it to Sunlit Marsh, and though the wordiness of the original dual can be tough to read, the difference is the drawback of the Marsh coming down with land summoning sickness
Its worth mentioning The Lost Cavern of Ixalans Explorers of the Deep Commander Precon, which cares quite about Merfolk and +1/+1 counters but if you arent fussed about budget, Universes Beyond: Warhammer 40,000s Necron Dynasties is an incredibly strong Commander Precon, especially if youre a fan of the Games Workshop franchise (or Space Marine 2)