The mask isn't meant to hide his identity. It's meant to keep the viscera out of his eyes.

仮面は彼の正体を隠すためのものではない。臓物が目に入らないようにするためのものだ。

跳ね散らす凶漢

先制攻撃
解鎖（あなたはこのクリーチャーを、＋１/＋１カウンターが１個置かれた状態で戦場に出してもよい。これの上に＋１/＋１カウンターが置かれているかぎり、これではブロックできない。）

面具不是用来隐藏他的身分。这是用来不让内脏喷到他眼睛。

溅血刺客

先攻
脱缰（你可以让此生物进战场时上面有一个+1/+1指示物。只要其上有+1/+1指示物，它就不能进行阻挡。）

Splatter Thug

First strike
Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

RNA Guild Kit

First strike
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

Iconic Masters

Return to Ravnica

A creature with unleash can’t block if it has any +1/+1 counter on it, not just one put on it by the unleash ability.

Putting a +1/+1 counter on a creature with unleash that’s already blocking won’t remove it from combat. It will continue to block.

The unleash ability applies no matter where the creature is entering the battlefield from.

You make the choice to have the creature with unleash enter the battlefield with a +1/+1 counter or not as it’s entering the battlefield. At that point, it’s too late for a player to respond to the creature spell by trying to counter it, for example.