Cheapest priced copy (Murders at Karlov Manor Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Tesak, Judith's Hellhound 
Legendary Creature — Elemental Dog · 3/3 · Rare · Murders at Karlov Manor Commander · #346
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor Commander | 36 | Rare | $0.49 | — |
| Murders at Karlov Manor Commander | 346 | Rare | $0.79 | — |
5 rulings from Wizards of the Coast
- 2 February 2024You make the choice to have the creature with unleash enter the battlefield with a +1/+1 counter or not as it's entering the battlefield. At that point, it's too late for a player to respond to the creature spell by trying to counter it, for example.
- 2 February 2024Putting a +1/+1 counter on a creature with unleash that's already blocking won't remove it from combat. It will continue to block.
- 2 February 2024Count the number of attacking creatures when Tesak, Judith's Hellhound's last ability resolves, including Tesak itself if it's still on the battlefield, to determine how much mana to add.
- 2 February 2024A creature with unleash can't block if it has any +1/+1 counter on it, not just one put on it by the unleash ability.
- 2 February 2024The unleash ability applies no matter where the creature is entering the battlefield from.