"Gix doesn't want a people to rule but puppets to entertain his madness."
—Xantcha, Phyrexian outcast

「ギックスは支配できる人間を求めているんじゃないわ。彼の狂気を満足させる操り人形を求めているのよ。」
———ファイレクシアの締め出し者ザンチャ

ギックスの僧侶

ギックスの僧侶が戦場に出たとき、あなたのマナ・プールに{B}{B}{B}を加える。

Priest of Gix

When this creature enters, add {B}{B}{B}.

"Take my mind, so that it may serve the will of Phyrexia. Take my flesh, so I may become compleat."

When Priest of Gix enters, add {B}{B}{B}.

When Priest of Gix enters the battlefield, add {B}{B}{B} to your mana pool.

When Priest of Gix comes into play, add o
Bo
Bo
B to your mana pool.

The triggered ability isn't a mana ability. It uses the stack and can be responded to.

You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).