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While Ulamog itself doesn't do a whole lot for Eldrazi, the support cards for the creature type make it both easy to cast and allow you to play a ton of other powerful Eldrazi cards

Moving into other colors offers more alternatives, too

Includes 1 deck of 100 Magic cards (98 nonfoil cards and 2 Traditional Foil Legendary cards), a 2-card Collector Booster Sample Pack (contains 2 alt-border cards of rarity Rare or higher, at least 1 of which is Traditional Foil), 10 double-sided token cards, 1 deck box (can hold 100 sleeved cards), 1 strategy insert, and 1 reference card

Given how easy it was to acquire, there are likely quite a few copies of the card in the game, although there are two things that help to contribute to its rarity

You can't design without it in mind

They do this for typically smaller cards so they dont get shaken like crazy in the case