Lightning Reaver

The threat compounds. A 3/3 that connects once is a 3/3 that pings each opponent for one at end of turn; connect twice and the end-step burn doubles; connect a third time and the body has become almost irrelevant to the math. The combat damage trigger and the end-step damage feed each other, and because the charge counters never come off, every successful attack ratchets the clock permanently faster. Fear is what makes the engine close to inevitable: artifact creatures and black creatures are the only legal blockers, so against most boards the first hit lands unopposed, and the first hit is the one that starts the snowball. Haste means the attack arrives the turn it resolves, shaving a step off the windup. The fragility is the price: this is a 3/3 with no protection, so a single removal spell undoes every counter banked. That tension defines how the card plays. It does not threaten lethal on its own; it threatens lethal soon, and forces the question of whether you can answer it before the end-step damage outpaces your removal. Left alone for three or four turns it stops mattering whether it ever connects again, because the recurring burn finishes the job from the air. It is a payoff built entirely on tempo and unblocked aggression, rewarding the deck that can protect a single attacker long enough for the counters to do the killing.