Activate "Skill Drain" before this card is Summoned, in order to negate its effects. However, if you activate "Skill Drain" after this card is Summoned, this card will be unaffected by it.
Be aware that having "Skill Drain" active allows your opponent to Normal Summon their other "Qli" monsters (without Tributing) and have them retain their original (printed) ATK.
"Share the Pain" is 1 of the simplest way to eliminate this card, although your opponent should control no other monsters to force them to Tribute this card.
Since this card is immune to Spell/Trap Cards and the activated effects of Level 9 or lower monsters, the first alternative is destroying it by battle. Effects that boost your monsters' ATK, like "Honest" or "Blackwing - Kalut the Moon Shadow" can help in this regard.
"Shooting Quasar Dragon" not only beats this card with its 4000 ATK, but should your opponent use this card's effect to make you send a monster to the Graveyard, "Quasar Dragon" can negate the activation and destroy it at no cost.
If you use a Deck that revolves around "Shooting Quasar Dragon", you can also use "T.G. Halberd Cannon" since it has the exact same summoning requirements. "Halberd Cannon" can be used to negate the Normal Summon of this card and destroy it.
"Number 86: Heroic Champion - Rhongomyniad" with 3 or more Xyz Materials can defeat this card, since it won't be destroyed by battle, gains 1500 ATK and DEF (which will match the ATK of this card), and becomes unaffected by other card effects, including this card's effect that would reduce its ATK. Simply attack this card to destroy it while keeping "Rhongomyniad" on the field.
Using the effect of "Domain of the True Monarchs", you can use any "Monarch" monsters to attack it and gain 800 ATK, which is enough to destroy this card (That is assuming the card is actually tribute summoned).