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That includes a few of the Arcbound creatures, to include Arcbound Ravager

Number 6: Chronomaly Atlandis X LIGHT Rank 6 [ Machine / XyzEffect ] ATK 2600 DEF 3000 2 Level 6 monsters When this card is Xyz Summoned: You can target 1 "Number" monster in your Graveyard

Notice the hash marks behind the text box on the card Ghazban Ogress

If the player goes second, it can prove useful in summoning a monster from the extra deck right away

Because of the high life point cost of Countdown and other commonly played cards for the strategy, it's not uncommon to see life gain used in the deck as well

Pulling off this strategy to its fullest certainly (and rightfully) comes with a high Energy cost