The Necron decks The War in Heaven and the Chaos decks The Horus Heresy especially stand out to me
Yes, cards cast for their miracle cost go on the stack like other spells and can be countered like normal
For example, running two Supreme Verdict and a Wrath of God becomes even more powerful when Gideon of the Trials forces an opponent to go wide in order to properly push through damage
Just look at this How does one evaluate a card like this in a draft where you can also open Sol Ring, Swords to Plowshares, Flash, Ancestral Recall, The One Ring, Ragawan, Force of Will, Lightning Bolt and all the other very, very powerful cards that are in the Vintage Cube
This "King of the Monsters" is the biggest creature in the set, and its high mana cost is offset by the fact that you can cycle it if you're too far away from being able to cast it
Oko, Thief Of Crowns Has A Devastating Transformation Ability Oko, Thief of Crowns, is one of the most frustrating Planeswalkers to encounter in the entirety of Magic: The Gathering
