Thief of Blood

A 1/1 flyer for six mana that pays nothing on its own, which is exactly the point: this is a one-card board reset disguised as a body. The wipe is a replacement effect, applied as the creature enters, and the wording is deliberately total. It does not care whose counters they are or what kind: +1/+1 counters on creatures, loyalty on planeswalkers, charge counters on artifacts, fade and time counters, the persist and undying markers a board has accrued. All of it comes off, and all of it lands on a single Vampire as raw power. The asymmetry is the design: across a counters-heavy board this sweeps everyone's stored investments while leaving you holding a flying threat, and loyalty stripped from planeswalkers neuters them without the usual combat or burn. The limitation is that it happens exactly once. There is no way to keep the effect running, so the value is entirely front-loaded; afterward you are left with whatever bulk the entering creature scooped up, sitting on a 1/1 base that does nothing else. The body is durable in the ordinary way (combat damage does not strip its counters), but it is also a do-nothing once the board has been emptied, and a single sweeper carries it off with no return on the investment. This is an answer aimed at tables where counters are currency, one that rewards reading a board for accumulated value rather than the creatures sitting on top of it.