Giltspire Avenger

The tap ability is conditional revenge, and the condition is the whole design: it only destroys a creature that already drew blood from you this turn. Because combat damage lands on the opponent's turn, the window is tight; the Avenger threatens the attacker that just connected, and you have to act before the turn rolls over, not the next time around. That clause rewards leaving life open instead of reflexively chump-blocking. Let the trample creature or the unblocked attacker land its hit, then tap to answer it for free. The catch is that "destroy" is plain destruction: regeneration replaces it, and protection from the Avenger's colors (or hexproof, or shroud) keeps it off the target line entirely, so the cleanest marks are the creatures that hit you hardest and have nothing to hide behind. Exalted runs alongside as a separate plan, not a competing one: it triggers when any single creature you control attacks alone, so the Avenger can sit back as a defensive tapper while it pumps a different lone attacker, or it can swing solo and grow itself. The body is small, the abilities pull from opposite ends of combat, and holding both takes the full Bant cost. It reads as careful Human Soldier engineering from the multicolor era when three-color creatures were built to express a shard's temperament: green-white-blue here is tempo through patience, removal that arrives only after you have taken the hit.