Darkling Stalker

The Shade template, stretched onto a Spirit body and asked to do double duty. Shades have always sold the same fantasy: a creature with no fixed size, only the size your floating black mana lets it reach, so the threat scales with your land count and the opponent never knows what number it will be when it connects. This one adds regeneration to the pitch, which means the same mana that grows it also keeps it alive, and the two abilities compete for exactly the same resource. The conflict between offense and survival is the design. Every black mana spent on the +1/+1 is a black mana not held for the regenerate, so a turn where you swing big is a turn where the creature sits exposed to a clean block or anything that wants it dead. The cleaner Shades that came later, the ones that simply pumped without asking you to also pay for resilience, tend to be the ones that stuck; splitting the mana between attack and longevity makes this version more honest about its constraints than most. The body itself is a 1/1, which is the point: it is a blank threat that exists to be fed, a mana sink that turns a late-game flood of untapped Swamps into a single hard-to-kill attacker.