Cheapest priced copy (Innistrad: Crimson Vow): $0.35 at Card Kingdom, near mint, their price list as of .
Wedding Invitation 
Artifact · Common · Innistrad: Crimson Vow · #260
When this artifact enters, draw a card.
{T}, Sacrifice this artifact: Target creature can't be blocked this turn. If it's a Vampire, it also gains lifelink until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 527 | Common | $0.49 | $4.49 |
| Innistrad: Crimson Vow | 260 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 November 2021Activating Wedding Invitation's last ability targeting a creature that has already been blocked won't cause that creature to become unblocked.