@deck=(0 ... 51);
$card=32;

prune_deck($card, \@deck);

print join("\n",@deck);

sub prune_deck (
    my $dupe = shift; # we assign $dupe to the id of the card we just pulled
    my $deckref = shift;
    my @remainder; # a scratch array to hold what's left

    for my $card (@{$deckref}) {
        $card eq $dupe ? next : push(@remainder, $card); # save current card if not the one we pulled
    }

    @{$deckref}=(undef); # empty the deck
    push @{$deckref}, @remainder; # push back the remainder
    1;
}