A quick glance on eBay shows a fair few for sale still, but in varying graded conditions
It also works well in milling decks as a way to mill while doing something useful
While the Worldsire doesn't have trample or any other form of evasion, it should be large enough that you can kill anything that crosses its path, and the land ability should be what you're using this for, with things like Valakut, the Molten Pinnacle or Field of the Dead
A natural downside of decks that utilize big mana creatures is that if the ways to cheat around their mana cost aren't on the battlefield, the big spells will stay stuck in your hand
This page also lists all of the sets in reverse chronological order, to easily find the one you want
I will admit that it looks like Food mostly has an actual cost, as opposed to Bloodghast being free