mtg black cards that give haste Magic the Gathering Adventures: Amonkhet Set Review: o:haste identity:b t:creature · Scryfall

As a 4/4 for 5 mana, its already a solid body, but the real value comes from its ability to tap and remove a +1/+1 counter from one of your creatures to deal 2 damage to any target

Blue and white are not the best colours at fighting planeswalkers and so having a fairly safe Seal of "kill a planeswalker" you can make is great as well

Gilanra, Caller of Wirewood and Brinelin, the Moon Kraken are perfectly matched to ensure you get both

Generally you are better off with cheap targetted removal like Dispatch for known problems

Of course, I don't mean to make it sound bad, its incredible

An excellent reset button that doesnt even require much in the way of politics