Dross Ripper

The mana sink in artifact-creature form, built so a colorless body can keep scaling on a black activation. The 3/3 shell costs no colored mana to deploy, which lets any deck run it, but the pump is locked behind two generic and a black, so the engine only fires for decks that can pay the surcharge. That split is the whole point: cast it anywhere, but the late-game ceiling only opens up if your manabase wants it to. Each activation is small (a single +1/+1 that fades at end of turn), which keeps it from being a true bomb, but the repetition means a board stall favors whoever has the open mana, and the firebreathing it offers turns excess lands into combat reach without committing more cards to the table. The Phyrexian Dog frame places it among the disposable infantry of its era, the kind of artifact creature that looks unremarkable on rate yet quietly converts flooded hands into pressure. Its real design lineage is the firebreather, the Shivan Dragon style of mana-fed attacker translated into colorless artifact hardware that any color combination can borrow.