Cheapest priced copy (Double Masters 2022): $1.29 at Card Kingdom, near mint, their price list as of .
Deathbringer Liege 
Creature — Horror · 3/4 · Rare · Eventide · #85
Other white creatures you control get +1/+1.
Other black creatures you control get +1/+1.
Whenever you cast a white spell, you may tap target creature.
Whenever you cast a black spell, you may destroy target creature if it's tapped.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $1.29 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 200 | Rare | $1.29 | $2.49 |
| Double Masters 2022 | 485 | Rare | — | — |
| Commander 2021 | 214 | Rare | $1.99 | — |
| Eventide | 85 | Rare | $2.49 | $16.99 |
3 rulings from Wizards of the Coast
- 1 August 2008The abilities are separate and cumulative. If another creature you control is both of the listed colors, it will get a total of +2/+2.
- 1 August 2008If you cast a spell that's both white and black, the last two abilities will both trigger. You may use them together to destroy any creature. To do so, put the "destroy" ability on the stack first, then put the "tap" ability on the stack, with each one targeting the same creature. When the abilities resolve, they'll tap the creature, then destroy it.
- 15 June 2010The last ability can target any creature, not just a tapped creature (it doesn't say "target tapped creature"). When the ability resolves, check whether the creature is tapped or not. If it's tapped, you may destroy it. If it's not tapped, the ability does nothing.