Urza is one of the strongest casual commanders available experienced pods will know he needs to be stopped immediately
That creature has indestructible for as long as it has a divinity counter on it
It draws a card and discards a card, but you don't have to discard the card so long as you attacked this turn--which you probably did if you're using ninjas
The card is based on Atraxa, Grand Unifier
Though she has a cost of 7 Ink, Clarabelle is a Floodborn character, which means that she has the Shift keyword, allowing her to be played directly on top of another Clarabelle card, for a reduced cost (in a manner reminiscent of how evolving works in Pokemon)
This can take someone out of the game with just one attack, as you only need it to have ten power to one-shot someone