Cheapest priced copy (Fallout): $0.49 at Card Kingdom, near mint, their price list as of .
Bighorner Rancher 
Creature — Human Ranger · 2/5 · Uncommon · Fallout · #73
Vigilance
{T}: Add an amount of {G} equal to the greatest power among creatures you control.
Sacrifice this creature: You gain life equal to the greatest toughness among other creatures you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $17.99 at Card Kingdom
2 rulings from Wizards of the Coast
- 8 March 2024Bighorner Rancher’s second ability is a mana ability. It doesn’t use the stack and can’t be responded to. If the greatest power among creatures you control is somehow 0 or less, no mana is added.
- 8 March 2024The amount of life you gain from Bighorner Rancher’s last ability is determined when the ability resolves. If at that time the greatest toughness among creatures you control is 0 or less (probably because all of your other creatures were destroyed or otherwise left the battlefield in response), you won’t gain any life.