When X Untaps

FrançoisV wrote:

The afflicted vampire has to get from a tapped state to an untapped state for the burn blood effect to trigger.

LSJ wrote:

Sten During wrote:
>
> Having followed the thread about Riddle Phantasique I note that it's
> made clear that all cards untap in the beginning of the untap-phase.
> Does this mean that Vampiric Disease will make an untapped, diseased
> vampire burn one blood at the beginning of the untap-phase?
> There are probably several other cards for which this question is
> valid as well.
No.
As per that thread, effects which occur when a vampire untaps occur
when the vampire changes from a tapped state to an untapped one.
Untapping an untapped vampire has no effect.