[Deviance]

You can do like this

#include <amxmodx>
#include <cstrike>
#include <fun>

new GhostEnable;
new GhostCost;
new GhostHealth;

new Origin[33][3];

new GhostStones[33];

public plugin_init() {
    register_plugin("Ghost Respawning", "1.01", "MaTTe");
    
    GhostEnable = register_cvar("ghost_enable", "1");
    GhostCost = register_cvar("ghost_cost", "10000");
    GhostHealth = register_cvar("ghost_health", "50");
    
    register_event("DeathMsg", "event_deathmsg", "a");

    register_logevent("logevent_round_start", 2, "1=Round_Start");
    register_logevent("logevent_round_end", 2, "1=Round_End");
    
    register_clcmd("say /buystone", "cmdBuystone");
}

public logevent_round_end() {
    new players[32], num;
    get_players(players, num);
    new player;
    for(new i=0;i<num;i++) {
        player = players[i];
        set_user_rendering(player, kRenderFxNone, 255, 255, 255, kRenderNormal, 255);
    }
}

public logevent_round_start()
    client_print(0, print_chat, "[Ghost Respawning] Type /buystone to buy a respawn stone.");

public event_deathmsg() {
    if(get_pcvar_num(GhostEnable)) {
        new victim = read_data(2);
    
        if(GhostStones[victim] && is_user_connected(victim)) {
            get_user_origin(victim, Origin[victim]);

            new parm[1];
            parm[0] = victim;

            set_task(3.0, "ghost_player", 72, parm[0], 1);
        
            GhostStones[victim]--;
        }
    }
}

public cmdBuystone(id) {
    if(!get_pcvar_num(GhostEnable))
        return PLUGIN_HANDLED;
        
    if(!is_user_alive(id) || !is_user_connected(id))
        return PLUGIN_HANDLED;
    
    new Money = cs_get_user_money(id);
    new Cost = get_pcvar_num(GhostCost);
    
    if(Money < Cost) {
        client_print(id, print_chat, "[Ghost Respawning] You do not have enough money to buy the respawn stone.");
        return PLUGIN_HANDLED;
    }
    
    cs_set_user_money(id, Money - Cost);
    GhostStones[id]++;
    
    client_print(id, print_chat, "[Ghost Respawning] Respawn stone succefully bought. (%d in backpack)", GhostStones[id]);
    
    return PLUGIN_HANDLED;
}

public ghost_player(parm[1]) {
    spawn(parm[0]);
    Origin[parm[0]][2] += 20;
    set_user_origin(parm[0], Origin[parm[0]]);
    set_user_rendering(parm[0], kRenderFxNone, 255, 255, 255, kRenderGlow, 40);
    set_user_health(parm[0], get_pcvar_num(GhostHealth));
}

Also if you want i can help you some more, just add me on MSN if you want.