Peace Strider

Colorless lifegain bolted to a forgettable body is one of deck construction's least glamorous jobs, and this fills it cleanly. The 3/3 is filler; the three life on entry is the entire reason the card exists. What buys it a slot is the artifact type, which lets a deck reach for incidental life without committing to a color. That matters most in builds that treat artifacts as a resource rather than a theme: an aggressive artifact shell wanting a buffer against the mirror, or a controlling deck that needs a body and a few points of life off the same card. The lifegain keys off entering the battlefield rather than being cast, so any blink or recursion effect turns the construct into a repeatable three-life faucet, and a sacrifice-and-return loop spins it into a modest life engine. None of that is flashy, and four mana for a 3/3 plus three life sits well below the curve on raw efficiency. The card knows its lane: a colorless utility creature for decks that want lifegain to cost no color identity, printed at common where it does quiet work and asks for nothing in return.