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 |
|---|---|---|---|
| Feeding Frenzy | 2B | Instant | Target creature gets -X/-X until end of turn, where X is the number of Zombies on the battlefield. |
| capital offense | 2BB | instant | target creature gets -x/-x until end of turn, where x is the number of times a capital letter appears in its rules text. (ignore reminder text and flavor text.) |
| Heartlash Cinder | 1R | Creature — Elemental Warrior | Haste Chroma — When Heartlash Cinder enters the battlefield, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control. 1/1 |
| Nirkana Revenant | 4BB | Creature — Vampire Shade | Whenever you tap a Swamp for mana, add an additional {B}. {B}: Nirkana Revenant gets +1/+1 until end of turn. 4/4 |
| Stabbing Pain | B | Instant | Target creature gets -1/-1 until end of turn. Tap that creature. |
| Guest List | Artifact — Contraption | Whenever you crank Guest List, target creature gets -X/-X until end of turn, where X is the number of creature cards in its controller's graveyard. | |
| Demonspine Whip | BR | Artifact — Equipment | {X}: Equipped creature gets +X/+0 until end of turn. Equip {1} |
| Nightmarish End | 2B | Instant | Target creature gets -X/-X until end of turn, where X is the number of cards in your hand. |
| Festive Funeral | 4B | Instant | Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard. |
| Olivia's Midnight Ambush | 1B | Instant | Target creature gets -2/-2 until end of turn. If it's night, that creature gets -13/-13 until end of turn instead. |