Strong, the Brutish Thespian

Enrage is a mechanic built on a paradox: it wants your creature to get hit, turning removal and blocks into fuel, and most enrage payoffs are calibrated as a single event so that letting the creature live still stings. This one breaks that calibration by stacking three +1/+1 counters every time damage lands, so a chump block or a small ping leaves behind a bigger body than the one that walked into combat, while Ward taxes every attempt to kill it cleanly rather than through damage. The genuinely clever knot is the radiation clause. Rad counters are ordinarily a slow poison that mills you and drains life, and enrage hands you three of them alongside the growth, so a creature designed to be attacked into is also seeding its own downside on contact. The inversion defuses exactly that downside: instead of losing life from radiation, you gain it, converting the drain into a cushion. The distinction worth being precise about is that the life loss from radiation is not damage, so it never fed the enrage trigger to begin with; the two systems run in parallel rather than looping into a runaway spiral. What is left is three effects that would each read as a drawback in isolation (a creature that begs to be hit, a counter type that erodes you, a life cost) wired so that being damaged simultaneously builds the body, banks the rad you have chosen to treat as a resource, and refills your life total.