The owner of this deck hasn't added a sideboard, they probably should...
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This deck abuses the interaction between spawnsire of ulamog and training grounds (preferrably 2 copies) to make either large, or arbitrarily large numbers of eldrazi spawn. It can also use spawnsire's second ability to dump in eldrazi from the sideboard- which will basically have whatever eldrazi you happen to have lying around. It probably is slow and doesn't work great, but its funny, although not as funny as the version that uses the 200 card deck win condition card and spawnsires in 200 copies of emrakul.
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