Hacker Noir

When Noir Hacker enters the battlefield, target
player must shuffle 5 virus cards into their library (There can be a maximum of 15 viruses in one
deck at a time). Each virus has "in order to discard
this card, pay 1 life".
{2}{b} {t} Place a virus card on the top of target
player's library unless they pay {3}.
"Sixteen years, and you brats still can't undo my handiwork!"