Woodlurker Mimic

The single hybrid pip in its cost is a feint: it costs almost nothing to play, but the payoff keys off something the mana never has to pay for, namely casting a spell that carries both black and green colors. Any black-and-green gold card qualifies, and so does any black/green hybrid spell, since those count as both colors regardless of which mana actually paid for them. Meet that condition and the 2/1 swings up to a 4/5 with wither for the turn. The body it is bolted to is deliberately fragile, which is exactly what makes the buff matter: a small two-drop that briefly becomes a 4/5 is a real combat upgrade, and wither converts that temporary size into something that lingers, dealing damage as permanent -1/-1 counters rather than the kind that wipes clean at cleanup. Because each trigger lasts only the turn, the card rewards sequencing: hold the qualifying spell until you want to attack, and the pump becomes a recurring counter-shrinking strike instead of a static stat line. The floor is low on purpose, a 2/1 with an idle trigger in any deck that cannot reliably color its spells across the guild, which is what lets the ceiling sit where it does. It is a payoff aimed at decks already committed all the way into one color pair, where a black-and-green spell is the baseline rather than a lucky alignment.