Sif's Spearmaster
The 1/4 body is the whole design brief here: a wall that fights back. Toughness this high on a three-mana creature signals a card built to survive combat and stick around, but the tap ability converts that survivability into an offensive clock instead of a purely defensive one. Because the pinging keys off power rather than a fixed number, this is a defender-shaped body playing an attacker's game: it sits back, blocks anything you need it to, and every untap step can chip a point off an opponent's face at will. The line of designs this belongs to runs through Prodigal Sorcerer and Cunning Sparkmage, tap-to-ping creatures whose value has always been leverage rather than tempo, but those precedents lean on higher power or an anthem effect to matter. At 1 power, the recurring point of damage is a slow drip on its own; the card is asking to be paired with a way to pump its power, at which point the same tap becomes a repeatable, targeted burn spell that dodges summoning sickness after the first turn and never spends a card. The sorcery-speed feel of an attack disappears entirely: the ability reaches across the table on your terms, without the creature ever leaving home or exposing itself to blockers. It is a slow engine dressed as a blocker.
