Cheapest priced copy (Conflux): $0.99 at Card Kingdom, near mint, their price list as of .
Bloodhall Ooze 
Creature — Ooze · 1/1 · Rare · Conflux · #59
At the beginning of your upkeep, if you control a black permanent, you may put a +1/+1 counter on this creature.
At the beginning of your upkeep, if you control a green permanent, you may put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 59 | Rare | $0.99 | $2.49 |
2 rulings from Wizards of the Coast
- 1 February 2009A permanent that’s both black and green will allow both abilities to trigger (as will separate black permanents and green permanents, of course).
- 1 February 2009The “intervening ‘if’ clause” means that (1) the ability won’t trigger at all unless you control a permanent of the specified color, and (2) the ability will do nothing unless you control a permanent of the specified color at the time it resolves.