Vigor

Combat damage is a transaction this Incarnation refuses to pay on your side. Where most creatures absorb a hit and trade toughness for the privilege of fighting, the prevention clause stops every point of damage that would land on your other creatures and converts it into permanent size: block all day, and your board gets bigger doing it. The interaction with fight effects and pingers turns what should be attrition into growth, and a 6/6 trampler with this rule running underneath it makes blocking against you actively harmful, since whatever your opponent throws at the rest of your team comes back as counters. The graveyard clause is what keeps a six-mana body from being a one-time investment: it is a triggered ability, so Vigor genuinely dies, hits the yard, and shuffles back in from there. That distinction is load-bearing. Because the shuffle happens after the trip through the graveyard, it triggers your own death-matters effects on the way out, and an opponent holding instant-speed graveyard exile has a window to strand it before the trigger resolves. The design wants a creature that is durable but not immortal: hard to grind out through ordinary removal and sacrifice, yet still answerable by anyone willing to fight on the graveyard axis. The whole thing reads as a study in what damage prevention looks like when it is an offensive asset rather than a defensive one: not a fog, but a feeding mechanism that punishes every attempt to hurt your team.