Berserkers of Blood Ridge

The drawback is the whole design budget here: a 4/4 for five mana is exactly the rate vanilla math gives you at that cost, and the must-attack clause is the string that lets a common occupy this slot without doing anything else. It is a body in the four-power range, nothing more, and the forced attack is what red has always paid in exchange for raw stats. That clause matters more than the simplicity suggests: it strips out the decision of when to hold back, so the creature cannot stay home to block a turn it might want to, and it walks into removal or a chump-and-trade on the defender's terms. This is the trade red has been making since its earliest must-attack creatures: you get a clean, undiscounted body and surrender control of the combat step. As filler, it does the job it was built for and no other, a curve-topping common that asks only that you already intended to be the aggressor.