There are a few general factors that influence the cost of a pack, namely circulation status, rarity, and chase cards
Many lifegain payoffs care about gaining 3-4 life in a single turn, so this white halfling can be part of a powerful value engine when you throw it together with the likes of Griffin Aerie and The Book of Exalted Deeds
The LEGEND mechanic was rarely used competitively, most Legendary Pokmon during the Diamond & Pearl era were laughable (unless, of course, they could Level Up), and Legendary Pokmon in the ex series days were hit or miss
However, I noticed that it shares the same art with another card in the same set
It doesn't matter if it's holographic cards or legendary
There's the concept of virtual card advantage, which basically equates getting rid of dead cards as effectively the same as drawing cards