I really enjoy this archetype in Commander, as mono-black blink/Panharmonicon is a cool way to play that uses a lot of unique cards and synergies to make the best use of that entry trigger
Everything I said about Exploration is true here, and then some
Now, its not sweeping X or less, which is sad, but it can always sweep tokens for zero mana (unless they are copies, in which case they have the copied casting cost.)
Since Newtraxa costs seven, and we need to get to that reliably
Welcome to Magic: The Gathering In Magic: The Gathering, you take on the role of a powerful mage, casting spells in epic battles with your friends
Consequently, this card is best used in decks that play creatures with attack triggers like Kroxa, Titan of Death's Hunger