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 |
|---|---|---|---|
| Hell Swarm | B | Instant | All creatures get -1/-0 until end of turn. |
| Infest | 1BB | Sorcery | All creatures get -2/-2 until end of turn. |
| Languish | 2BB | Sorcery | All creatures get -4/-4 until end of turn. |
| Marsh Gas | B | Instant | All creatures get -2/-0 until end of turn. |
| Nausea | 1B | Sorcery | All creatures get -1/-1 until end of turn. |
| Rags | 2BB | Sorcery | All creatures get -2/-2 until end of turn. |
| Shrivel | 1B | Sorcery | All creatures get -1/-1 until end of turn. |
| Dictate of Karametra | 3GG | Enchantment | Flash Whenever a player taps a land for mana, that player adds one mana of any type that land produced. |
| Eyeblight Massacre | 2BB | Sorcery | Non-Elf creatures get -2/-2 until end of turn. |
| Holy Light | 2W | Instant | Nonwhite creatures get -1/-1 until end of turn. |