It also has a secondary effect wherein players may pay 3 generic mana, and also pay life equal to the number of colors in their Commanders color identity
Split second blocks players from casting new spells and activating abilities, but it doesn't affect mana abilities, triggered abilities, or special actions like morph
I would never maindeck Ashiok, Dream Render right now, but, similarly to Blood Operative, its a valid option if escape proves to be powerful enough, as its both hoser for their escape cards and enabler for yours
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Thats standard enough, but you can also pay four mana instead and overload it to wipe out every creature on the board
Board wipes that remove permanents through other means, like Cyclonic Rift or Sunfall, do remove indestructible creatures