Bleeding the Vine

Hello all!

If Bleeding the Vine is tapped at the beginning of your untap phase, must you pay 1 pool to untap it?

Bleeding the Vine
Type: Master
Cost: 1 pool
Unique master.
Put this card into play. During your untap phase, tap this card or burn 1 pool. You may tap this card to cancel a non-out-of-turn master card played by another Methuselah as that card is played. That card has no effect (no cost is paid), and that Methuselah gains another master phase action.

Untap BtV at the begining of your untap phase (like every other 'normal' cards). And then burn one pool or tap BtV. You can decide it whenever you want at your untap phase.