Nightshade Dryad

Every green two-drop that taps for color has historically been a pure liability in combat: tap it for mana and it dies to a stiff breeze, block with it and it trades down against anything bigger. Deathtouch rewrites that math. This one holds the ground it stands on, and it fixes with real reach: colorless on demand, or any color when the deck needs it, so it can fill a curve gap or splash a fourth color without pulling a dedicated fixer into the slot. The friction is that both mana modes share the one tap, so it accelerates you at the pace of a single activation per turn rather than the way a two-for-one ramp piece would; it is a fixer with a body, not an engine. The payoff hides in the untapped body. A 1/2 deathtoucher left back is a deterrent all by itself: any attacker that runs into it dies regardless of size, so on turns you do not need the mana, leaving it up becomes a genuine decision rather than a wasted one. It sits in the long line of green utility creatures asked to justify a slot by doing two jobs at once, and the specific pairing here (color fixing stapled to a body that punishes aggression outright) answers that brief more cleanly than most of its predecessors managed.