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 |
|---|---|---|---|
| Weed-Pruner Poplar | 4B | Creature — Treefolk Assassin | At the beginning of your upkeep, target creature other than Weed-Pruner Poplar gets -1/-1 until end of turn. 3/3 |
| Zhur-Taa Ancient | 3RG | Creature — Beast | Whenever a player taps a land for mana, that player adds one mana of any type that land produced. 7/5 |
| Painbringer | 2BB | Creature — Human Minion | {T}, Exile any number of cards from your graveyard: Target creature gets -X/-X until end of turn, where X is the number of cards exiled this way. 1/1 |
| Witch's Vengeance | 1BB | Sorcery | Creatures of the creature type of your choice get -3/-3 until end of turn. |
| Stench of Decay | 1BB | Instant | Nonartifact creatures get -1/-1 until end of turn. |
| Mutilate | 2BB | Sorcery | All creatures get -1/-1 until end of turn for each Swamp you control. |
| Biting Rain | 2BB | Sorcery | All creatures get -2/-2 until end of turn. Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.) |
| Eloren Wilds | Plane — Shandalar | Whenever a player taps a permanent for mana, that player adds one mana of any type that permanent produced. Whenever chaos ensues, target player can't cast spells until a player planeswalks. | |
| Vicious Offering | 1B | Instant | Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.) Target creature gets -2/-2 until end of turn. If this spell was kicked, that creature gets -5/-5 until end of turn instead. |
| Bone Flute | 3 | Artifact | {2}, {T}: All creatures get -1/-0 until end of turn. |