Benevolent Hydra

The replacement effect is the whole architecture here, and it points in a subtly different direction than most counter-multipliers. Where Doubling Season or Hardened Scales care about counters landing on any permanent (this creature included), the static clause fires only when counters would go onto another creature you control, and it routes the bonus to that same recipient: every counter you place elsewhere becomes that many plus one, added to the creature already receiving them. The Hydra functions as a walking Hardened Scales for your other creatures, and only for them; its own counters, whether the pile it enters with or anything grown afterward, never collect the extra one. The activated ability supplies the other half. Tap, pull a counter off the Hydra, and it lands on another creature you control, where the replacement effect is already in force and turns that single counter into two. That coupling is deliberate: you load the battery as it enters and discharge it a counter at a time, each discharge padded by one on arrival. Neither half can point back at the Hydra itself, which is what keeps a 1/1 base from compounding on its own power. What you have is a counters-matters commander shrunk into a single card, a self-contained engine built to funnel counters through a spread of small creatures rather than voltron a single target; its ceiling scales with how many counter sources you can chain into it.