Stinkdrinker Bandit

The Prowl discount is the obvious lure, but the second line is the part that actually wants building around: every unblocked Rogue you control swings for an extra +2/+1, not just this Goblin. That turns a tribe of small evasive bodies into a cascade of damage the moment your opponent declines to block, and the design quietly rewards going wide with Rogues rather than tall with one threat. The two abilities feed each other in sequence: connect with a Goblin or Rogue, cast this for the cheaper cost, then untap into a turn where every unblocked Rogue is suddenly bigger than the board math suggested. The defender is left guessing on blocks, since chump-blocking one attacker leaves the rest to grow. The body itself is fragile, which is the honest cost: a 2/1 dies to almost anything and contributes its own +2/+1 only when it gets through, so the engine lives or dies on keeping a Rogue squad attacking unblocked turn after turn. That makes it a build-around lord in everything but name, a card whose ceiling is set by how many evasive Rogues surround it rather than by what it does in a vacuum.