Brainiac, AI Sentry

When Brainiac, AI Sentry enters the battlefield,
each opponent reveals their hand. For each
opponent, exile a creature card they revealed
this way until Brainiac, AI Sentry leaves the battlefield.
{x}: Choose a creature card exiled with Brainiac,
AI Sentry with converted mana cost X. Brainiac,
AI Sentry becomes a copy of that card.