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 |
|---|---|---|---|
| Urborg Shambler | 2BB | Creature — Horror | Other black creatures get -1/-1. 4/3 |
| Mirran Mettle | G | Instant | Target creature gets +2/+2 until end of turn. Metalcraft — That creature gets +4/+4 until end of turn instead if you control three or more artifacts. |
| Nocturnal Raid | 2BB | Instant | Black creatures get +2/+0 until end of turn. |
| Chilling Trap | U | Instant | Target creature gets -4/-0 until end of turn. If you control a Wizard, draw a card. |
| Stream of Unconsciousness | U | Tribal Instant — Wizard | Target creature gets -4/-0 until end of turn. If you control a Wizard, draw a card. |
| Infernal Darkness | 2BB | Enchantment | Cumulative upkeep—Pay {B} and 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) If a land is tapped for mana, it produces {B} instead of any other type. |
| Blazing Shoal | XRR | Instant — Arcane | You may exile a red card with mana value X from your hand rather than pay this spell's mana cost. Target creature gets +X/+0 until end of turn. |
| Bloodthirsty Ogre | 2B | Creature — Ogre Warrior Shaman | {T}: Put a devotion counter on Bloodthirsty Ogre. {T}: Target creature gets -X/-X until end of turn, where X is the number of devotion counters on Bloodthirsty Ogre. Activate only if you control a Demon. 3/1 |
| Huatli's Spurring | R | Instant | Target creature gets +2/+0 until end of turn. If you control a Huatli planeswalker, that creature gets +4/+0 until end of turn instead. |
| Korozda Gorgon | 3BG | Creature — Gorgon | Deathtouch {2}, Remove a +1/+1 counter from a creature you control: Target creature gets -1/-1 until end of turn. 2/5 |