Vagrant Plowbeasts

A regeneration shield with a strange admission threshold: the 6/6 body can keep itself standing for one mana, but the ability protects only creatures with power 5 or greater, so it refuses to guard the small attackers that usually want a regenerator most. That restriction tells you what the card was built for. Regeneration here works the way it always has: it replaces a destruction event with a tap-and-remove-from-combat effect, so the play is to pay one mana ahead of time and attack into bigger blockers, letting your fatty "die" in combat only to survive tapped instead of heading to the graveyard. The power-5 floor keeps it from being generic combat insurance and instead ties it to a board of large green-white beaters, the kind that trade up and walk away from the wreckage one combat at a time. The honest caveats are the ones regeneration always carries: it does nothing against exile, against bounce, against -X/-X that drops toughness to zero, or against any effect that says the creature can't be regenerated, and most modern board wipes are written to route around it on purpose. That marks it as a creature-combat tool rather than a true safety net: a defensive engine for a deck full of large bodies that wants to attack into everything and dare the opponent to block, repeatedly shrugging off the destruction that combat and targeted removal would otherwise deal.