Cheapest priced copy (Streets of New Capenna): $2.29 at Card Kingdom, near mint, their price list as of .
Sanctuary Warden 
Creature — Angel Soldier · 5/5 · Mythic · Streets of New Capenna · #343
Flying
This creature enters with two shield counters on it.
Whenever this creature enters or attacks, you may remove a counter from a creature or planeswalker you control. If you do, draw a card and create a 1/1 green and white Citizen creature token.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $2.29 to $5.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Streets of New Capenna Promos | 30p | Mythic | $3.99Out of stock | $4.99 |
| Streets of New Capenna Promos | 30s | Mythic | — | $5.49 |
| Streets of New Capenna | 30 | Mythic | $2.29 | $2.49 |
| Streets of New Capenna | 343 | Mythic | $2.49 | $2.49Out of stock |
| Streets of New Capenna | 443 | Mythic | — | — |
7 rulings from Wizards of the Coast
- 29 April 2022If a permanent with a shield counter is dealt unpreventable damage, that damage will be dealt and a shield counter will still be removed.
- 29 April 2022Shield counters don't prevent players from sacrificing creatures.
- 29 April 2022If a permanent that would be dealt damage has more than one shield counter on it, that damage is prevented and only one shield counter is removed.
- 29 April 2022Removing a shield counter in this way isn't the same as regenerating a creature.
- 29 April 2022Sanctuary Warden's triggered ability allows you to remove any kind of counter, not just a shield counter.
- 29 April 2022"Shield" is not an ability that creatures have and shield counters are not keyword counters. If a creature with a shield counter loses its abilities, the shield counter will still protect it as normal.
- 29 April 2022A creature with a shield counter on it may still be destroyed by state-based actions if it has damage marked on it equal to its toughness or has been dealt unpreventable damage by a source with deathtouch.