Casting a card as an Omen isn't casting it for an alternative cost
We do get a bit blown out by Wrath of God, but we should be able to rebuild quickly with all the card draw
Beyond its monetary value, though, this cards in-game value is not up for debate, as any Storm deck or deck that focuses on resolving lots of spells consecutively would be utterly destroyed by this cards alternate casting cost of zero though it must be noted this card does not technically counter spells but exiles them instead
Our goal is to protect ourselves early by amassing an army (Moria Scavenger) and stealing our opponents stuff (Hostage Taker) while milling/discarding huge haymakers (Rampaging War Mammoth)
Its a massive toll for killing it, which makes sense for a creature thats literally holding up the sky
For Kamigawa: Neon Dynasty, Wizards of the Coast comes with a set of two brand new Commander Decks