ファイレクシアの処理装置

ファイレクシアの処理装置が戦場に出るに際し、望む点数のライフを支払う。
{4}, {T}：黒のＸ/Ｘのミニオン・クリーチャー・トークンを１体戦場に出す。Ｘはファイレクシアの処理装置が戦場に出るに際し支払われたライフの点数に等しい。

Phyrexian Processor

As this artifact enters, pay any amount of life.
{4}, {T}: Create an X/X black Phyrexian Minion creature token, where X is the life paid as this artifact entered.

The Brothers' War Retro Artifacts

As Phyrexian Processor enters the battlefield, pay any amount of life.
{4}, {T}: Create an X/X black Phyrexian Minion creature token, where X is the life paid as Phyrexian Processor entered the battlefield.

From the Vault: Lore

As Phyrexian Processor enters the battlefield, pay any amount of life.
{4}, {T}: Put an X/X black Minion creature token onto the battlefield, where X is the life paid as Phyrexian Processor entered the battlefield.

Duel Decks: Phyrexia vs. the Coalition

You can pay 0 life if you want, but it's not useful most of the time.