This is due to cards such as Athreos, God of Passage, but more importantly, were gaining Mana Confluence
Theres a combo build here with Forsaken Miner and Phyrexian Altar or Warren Soultrader , or you can just flip him over to his One-Winged Angel side and go to town sacrificing tokens and other fodder to draw tons of cards
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In addition, it's also a new Eldrazi, something that hasn't been seen in a Standard set since 2016's Eldritch Moon
You can cast another spell before any player can attempt to remove Omniscience with spells or abilities
Sets come and go, but the core principle of play small creatures, attack every turn remains, a constant, necessary force to prevent every game from descending into Combo chaos or grinding on for turns on end