If you Special Summon this card, its attack is 2800, but you can also summon it normally as a 1400-attack monster or Tribute Summon it to get around its effect.
If you Summoned this card without Tribute, and then "Skill Drain" is later activated, the ATK and DEF are no longer halved. If "Skill Drain" is later destroyed, the ATK and DEF still remain at 2800 and 2000.
After Summoning this monster with no Tribute, use "Interdimensional Matter Transporter" to banish and get it back later, thus reseting its effect. This way, your opponent should contend with that colossal monster.