Generally ordinary mail but you can request them to send the card to you by courier (DHL or FedEx) if you're prepared to pay the courier fee. They sent mine by DHL. The process involves depositing enough money or coins into your Mistertango account to cover the courier fee.

If you request for DHL or FedEx they will respond with a quotation or price. They probably call the courier company in Vilnius first to check the cost of delivery to your country. If you respond and agree with the quotation, the courier fee will be taken from your Mistertango balance and the card will arrive quickly. I got mine within a few days.