Cheapest priced copy (Ravnica Allegiance): $0.35 at Card Kingdom, near mint, their price list as of .
Open the Gates 
Sorcery · Common · Ravnica Allegiance · #133
Search your library for a basic land card or Gate card, reveal it, put it into your hand, then shuffle.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica Allegiance | 133 | Common | $0.35 | $0.99 |
| Ravnica Remastered | 151 | Common | $0.35 | $0.49 |