PayPal

The good thing about accepting PayPal is that it will let my sell Stella's MtG cards to a wider audience.

The bad thing is that that the prices individual cards fetch, the fees eat up most of the result.

Fortunately, eBay in Germany runs predominantly over bank-to-bank money transfers, which have no (direct) costs to senders or recipients; PayPal is strongly recommended by eBay but not (yet?) mandatory.