Hello folks,
today i found a bug so that the script doesn't get the correct "Estimated Value" when the card has a level greater 1 or more than 1 xp(combined cards).

To fix the issue, just replace the foreach loop with the following lines:

foreach ($card in ($cardCollection | where { $_.edition -ne 6 }))
{
    $cardKey = [string]::Format("{0}::{1}::{2}", $card.card_detail_id, $card.gold, $card.xp);
    $tempCard = $cardArray | where { $_.Key -eq $cardKey } | select -First 1;
    if ($tempCard -eq $null)
    {
        $responseCardInfo = Invoke-RestMethod -Method Get -Uri ([string]::Format("https://api2.splinterlands.com/cards/find?ids={0}", $card.uid));
        $lowPriceBcx = -1.0;
        $cardSaleGroup = ($cardsForSale | where { ($_.card_detail_id -eq $card.card_detail_id) -and ($_.gold -eq $card.gold) -and ($_.level -eq $card.level) });
        if ($cardSaleGroup -eq $null)
        {
            $cardSaleGroup = ($cardsForSale | where { ($_.card_detail_id -eq $card.card_detail_id) -and ($_.gold -eq $card.gold) });
            $lowPriceBcx = $cardSaleGroup.low_price_bcx * $card.xp;
        }
        else 
        {
            $lowPriceBcx = $card.level -gt 1 ? $cardSaleGroup.low_price_bcx : $cardSaleGroup.low_price_bcx * $card.xp;
        }
        $cardArray += [PSCustomObject]@{ 
            Key = $cardKey
            Id = $card.card_detail_id
            Name = $responseCardInfo.details.name
            XP = $card.xp
            "Gold Foil" = $card.gold ? "Yes" : "No"
            "Estimated Value in $" = $lowPriceBcx -lt 0.0 ? "unknown" : [string]::Format("{0:0.000}", $lowPriceBcx) 
        };
    }
    else 
    {
        $cardArray += $tempCard;
    }
}

I will update the post soon too.