Kaisenberg

When you cast Kaisenberg, call/text Kaiden and he chooses a number between -20 and 20. That
number is X. If he doesn't answer, exile Kaisenberg and return him to the battlefield when
he answers.

When Kaisenberg enters the battlefield, draw X cards. If X is below 0, discard that many cards. Then, deal X damage to target opponent. If X is below 0, deal that much damage to yourself.