Cheapest priced copy (Commander 2020): $0.99 at Card Kingdom, near mint, their price list as of .
Deadbridge Chant 
Enchantment · Mythic · Duskmourn: House of Horror Commander · #215
When this enchantment enters, mill ten cards.
At the beginning of your upkeep, choose a card at random in your graveyard. If it's a creature card, put it onto the battlefield. Otherwise, put it into your hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.99 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 207 | Mythic | $0.99 | — |
| Ravnica: Clue Edition | 184 | Mythic | $0.99 | — |
| Dragon's Maze | 63 | Mythic | $1.29 | $10.99 |
| Duskmourn: House of Horror Commander | 215 | Mythic | $0.99 | — |
| GRN Guild Kit | 58 | Mythic | $0.99 | — |
| Modern Horizons 3 Commander | 258 | Mythic | $0.99 | $0.99 |
3 rulings from Wizards of the Coast
- 15 April 2013Because the last ability doesn't target any card in your graveyard, any card put into your graveyard in response to the ability may be chosen.
- 15 April 2013Each card in your graveyard must have an equal chance of being chosen. Assigning them each a number and rolling a die is an easy way to do this. In formats that allow you to rearrange your graveyard—including Standard, Modern, and Return to Ravnica block Limited formats, you may also shuffle your graveyard face down and choose a card at random.
- 15 April 2013The card is chosen at random as the ability resolves. If any player responds to the ability, that player won't yet know what card will be chosen.