on sign change:
    player is op
    if line 1 of block is "[Leader]":
        add block to {kills.signs::*}
        set {_skull} to skull of {topkiller}
        set the block above the block to {_skull}'s skull
        set line 1 of block to "&4&lTop Player"
        set line 2 of block to "&c%{topkiller}%"
        set line 3 of block to "&7"
        set line 4 of block to "&f%{topkills}%"

every 1 second:
    loop {kills.signs::*}:
        set line 2 of loop-value to "&a%{topkiller}%"
        set line 3 of loop-value to "&cKills: &f%{topkills}%"
        set block above loop-value to {topkiller}'s skull

on death of player:
    attacker is a player
    if {kills.%attacker%} isn't set:
        set {kills.%attacker%} to 0
    else:
        add 0 to {kills.%attacker%}
    {topkiller} isn't set:
        set {topkiller} to attacker
        set {topkills} to {kills.%attacker%}
    {kills.%attacker%} is greater than {topkills}:
        set {topkiller} to attacker
        set {topkills} to {kills.%attacker%}
    stop