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 |
|---|---|---|---|
| Iron Maiden | 3 | Artifact | At the beginning of each opponent's upkeep, Iron Maiden deals X damage to that player, where X is the number of cards in their hand minus 4. |
| Black Dragon | 5BB | Creature — Dragon | Flying Acid Breath — When Black Dragon enters the battlefield, target creature an opponent controls gets -3/-3 until end of turn. 4/4 |
| Powder Keg | 2 | Artifact | At the beginning of your upkeep, you may put a fuse counter on Powder Keg. {T}, Sacrifice Powder Keg: Destroy each artifact and creature with mana value equal to the number of fuse counters on Powder Keg. |
| Balduvian Rage | XR | Instant | Target attacking creature gets +X/+0 until end of turn. Draw a card at the beginning of the next turn's upkeep. |
| Oboro Envoy | 3U | Creature — Moonfolk Wizard | Flying {2}, Return a land you control to its owner's hand: Target creature gets -X/-0 until end of turn, where X is the number of cards in your hand. 1/3 |
| The Ruinous Powers | 2BR | Enchantment | At the beginning of your upkeep, choose an opponent at random. Exile the top card of that player's library. Until end of turn, you may play that card and you may spend mana as though it were mana of any color to cast it. When you cast a spell this way, its owner loses life equal to its mana value. |
| Sandstone Bridge | Land | Sandstone Bridge enters the battlefield tapped. When Sandstone Bridge enters the battlefield, target creature gets +1/+1 and gains vigilance until end of turn. {T}: Add {W}. | |
| Unnerving Assault | 2U/R | Instant | Creatures your opponents control get -1/-0 until end of turn if {U} was spent to cast this spell, and creatures you control get +1/+0 until end of turn if {R} was spent to cast this spell. (Do both if {U}{R} was spent.) |
| Winged Temple of Orazca | Legendary Land | (Transforms from Hadana's Climb.) {T}: Add one mana of any color. {1}{G}{U}, {T}: Target creature you control gains flying and gets +X/+X until end of turn, where X is its power. | |
| Phosphorescent Feast | 2GGG | Sorcery | Chroma — Reveal any number of cards in your hand. You gain 2 life for each green mana symbol in those cards' mana costs. |