Since [Number 42: Galaxy Tomahawk] requires two Level 7 monsters for its Xyz Summon, to consistently draw two or more of these cards in your opening hand of five , this many are necessary
switch control of this card with any monster your opponent controls (you choose)
Until the End Phase, it loses 500 ATK and during battle between that attacking monster and a Defense Position monster whose DEF is lower than the selected monster's ATK, inflict the difference as Battle Damage to your opponent
Red-Eyes Dark Dragoon also has a quick effect that lets you negate any card effect, destroy that card, and gain 1000 ATK
More importantly, this card never has to be summoned to be useful
If this card is discarded: You can Special Summon 1 "Danger!" monster from your Deck in Defense Position, except "Danger