Part hate piece, part efficient beater, this is a kill on sight card for a lot of people and can really disrupt a players game plan if it gets in
Make your opponents whole deck into a certain color, and then Grindstone mills them out
Boosters are great for draft
There are so many new options for the color that I will actually be shocked if a base-red deck doesnt emerge after Standard settles down
Take a look at MaRos articles describing new sets - he does not just dump the image gallery and say let me know what you think - he describes the sets design goals, the mechanics, why they were chosen, how those mechanics were placed in each colour, the limited archetypes the set was designed around, some anecdotes about the design process, etc
Howlsquad Heavy doesnt even require you to sacrifice creatures: Once you have Max Speed, you can just tap it for one red for each Goblin you control