You might not be able to ride him to Mordor, but you can certainly follow him to victory
Xolatoyecs main function is untapping any of your cards with counters on at the end of turn, effectively providing most of your merfolk with vigilance and untapping any lands bestowed with Flood Counters, freeing up mana for counterspells and reaction-based play
Much as the language I have used here is pretty biased, there is no right or wrong
They come with unique effects that can be utilized only once upon deploying the card
Few other Voltron commanders have this kind of card drawing capability, which makes Sram especially useful in the 99 of other Voltron Commander decks, though he's well-suited as the actual commander, too
Starnheim Unleashed Reminiscent of Entreat the Angels, Starnheim Unleashed makes angels at a worse rate when making multiples, but the worst case mode of making a 4-mana 4/4 flier is still pretty good