Card selection on a massive scale, free lifegain and even some bonus tokens at a cheap rate
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)
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
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Accumulated Knowledge (T1, Ext, S, Block) Accumulated Knowledge is a tricky card
Overall, Dual-Ink cards are an exciting new addition to a TCG that, while not desperately needing an upgrade, couldn't hurt to have a refresh