Cosmic Interventions foretell ability can really help to spread the cost over two turns, reducing the burden of holding up mana in proactive decks
Vintage tournaments are unsanctioned and allow growing numbers of proxies (usually five to ten, sometimes unlimited)
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Let's swap to Grist, the Plague Swarm, the potentially repeatable Naturalize is consistently relevant
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