This card can be used to Special Summon "Galaxy-Eyes Photon Dragon". When "Galaxy Zero" is destroyed by its effect and reduces the ATK of "Galaxy-Eyes" to 0, the effect of "Galaxy-Eyes" can be used to banish an opponent's monster. When "Galaxy-Eyes" returns to the field afterwards, its ATK will return to normal.
If you have "Tachyon" on your field, after you Special Summon a monster with this card, you can use Galaxy Cyclone to destroy this card, so the revived monster can attack and use its effects, and then use "Tachyon"'s effect, to restore the revived monster's attack back to normal
If "Tachyon" and "Galaxy-Eyes Cloudragon" are in your graveyard, you can Special Summon "Tachyon" with this card, then use "Cloudragon"'s effect to attach itself to "Tachyon", and then like in the case above, use "Cyclone" to destroy this card, and "Tachyon"'s effect to restore the attack.