M:tG card similarity search
3R · Enchantment
At the beginning of each upkeep, count the number of permanents. If the number is odd, until end of turn, red creatures get +1/+1 and whenever a player taps a Mountain for mana, that player adds an additional {R}. If the number is even, until end of turn, red creatures get -1/-1 and if a player taps a Mountain for mana, that Mountain produces colorless mana instead of any other type.
| Name | Mana | Type | Text |
|---|---|---|---|
| Savage Lands | Land | Savage Lands enters the battlefield tapped. {T}: Add {B}, {R}, or {G}. | |
| Seaside Citadel | Land | Seaside Citadel enters the battlefield tapped. {T}: Add {G}, {W}, or {U}. | |
| Sejiri Glacier | Land | Sejiri Glacier enters the battlefield tapped. {T}: Add {W}. | |
| Selesnya Guildgate | Land — Gate | Selesnya Guildgate enters the battlefield tapped. {T}: Add {G} or {W}. | |
| Shivan Oasis | Land | Shivan Oasis enters the battlefield tapped. {T}: Add {R} or {G}. | |
| Silundi Isle | Land | Silundi Isle enters the battlefield tapped. {T}: Add {U}. | |
| Simic Guildgate | Land — Gate | Simic Guildgate enters the battlefield tapped. {T}: Add {G} or {U}. | |
| Sky Diamond | 2 | Artifact | Sky Diamond enters the battlefield tapped. {T}: Add {U}. |
| Skyclave Basilica | Land | Skyclave Basilica enters the battlefield tapped. {T}: Add {W}. | |
| Song-Mad Ruins | Land | Song-Mad Ruins enters the battlefield tapped. {T}: Add {R}. |