Well you can always have one empty account, ie if you personally use revolut, then have empty transferwise account which even when charged has no funds. So really no need to pay premium for virtual disposable card 
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Ah good to know Vedran. I use Revolut’s dispsable cards for online shopping anyway, for security reasons, so I do need to have money on the account in those cases, but your suggestion does work well for free trials like the above example