Relentless Raptor

Two mana for a 3/3 with vigilance is a rate aggressive decks have always wanted, and the compulsion clause is how that rate gets paid: this thing fights whether or not you want it to. The vigilance is the clever half of the deal. Most "must attack" creatures hand the opponent a free swing on the back half, but pairing the compulsion with vigilance keeps the body home to block, so the same line of text that makes the forced attack dangerous also softens its punishment. The two clauses read each other: the creature attacks because it must, then stays back because it can. Where the cost bites is the "or blocks each combat if able" half, which the rate-conscious player forgets until a small attacker walks in and the Raptor is obligated to trade or stand in front of it. That is the seam an opponent pries at: bait the mandatory block with an expendable body, then let a pump effect or a well-timed trick resolve into the locked-in assignment. The design sits in a long red tradition of creatures that cannot not attack (Juggernaut and its descendants), updated with a second color and a keyword that lets the body double as defense, which is most of why a forced-combat two-drop reads as a tempo gift rather than a liability.