Sanguine Statuette

When Sanguine Statuette enters, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Blood token, you may have Sanguine Statuette become a 3/3 Vampire artifact creature with haste until end of turn.

Innistrad: Double Feature

Innistrad: Crimson Vow

If after becoming a creature, Sanguine Statuette becomes subject to an effect that reduces or increases its toughness, sacrificing another Blood token won't allow you to counteract that effect. For example, if a resolving spell gives it -2/-2 until end of turn, it will be a 1/1 creature, even if you set its power to 3/3 again.

If another effect sets Sanguine Statuette's power and/or toughness to another number, sacrificing a Blood token will set it back to 3/3. However, it would still be subject to any increases or reductions that are applying, as described above.