Gemini Spark: Tribute Opponent's monster?

Can my opponent use Gemini Spark to tribute my Elemental HERO Neos Alius to pay for the cost? Ruling problem came up in a mirror test duel.

I call complete cow dung though.

You may never tribute any opponent's monster to activate a card effect or to Special Summon a monster unless it is explicitely stated on the card (like Lava Golem, Volcanic Queen, Reptilliane Vaskii).
The answer is subsequently No, he may not tribute your Alius Neos with his Gemini Spark.

Irate beat me to the punch by mere seconds.

Thanks. Thought that was the case.

Because it's on the other side so can't tribute, right?

I mentioned that in my post, Yill.

Any other questions before I lock this topic, Xrai?

Not anything. You can go ahead and lock it. Though, I'd like a few examples of what cards you CAN use your opponent's side of the field for paying costs or an effect. That's all.

Lava Golem, Volcanic Queen, Reptilliane Vaskii.

That's about it.

~ Topic Locked