Tesak, Judith's Hellhound is a rare Legendary Creature — Elemental Dog card from Murders at Karlov Manor Commander (MKC), collector number 36. Current market price: $0.34, TCGplayer market prices via Scryfall.
Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.) Other Dogs you control have unleash. Creatures you control with counters on them have haste. Whenever Tesak attacks, add {R} for each attacking creature.