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 |
|---|---|---|---|
| Shizuko, Caller of Autumn | 1GG | Legendary Creature — Snake Shaman | At the beginning of each player's upkeep, that player adds {G}{G}{G}. Until end of turn, they don't lose this mana as steps and phases end. 2/3 |
| Flunk | 1B | Instant | Target creature gets -X/-X until end of turn, where X is 7 minus the number of cards in that creature's controller's hand. |
| Keeper of Progenitus | 3G | Creature — Elf Druid | Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced. 1/3 |
| Join the Dead | 1BB | Instant | Target creature gets -5/-5 until end of turn. Descend 4 — That creature gets -10/-10 until end of turn instead if there are four or more permanent cards in your graveyard. |
| Chittering Witch | 3B | Creature — Human Warlock | When Chittering Witch enters the battlefield, create a number of 1/1 black Rat creature tokens equal to the number of opponents you have. {1}{B}, Sacrifice a creature: Target creature gets -2/-2 until end of turn. 2/2 |
| Fyndhorn Pollen | 2G | Enchantment | Cumulative upkeep {1} (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.) All creatures get -1/-0. {1}{G}: All creatures get -1/-0 until end of turn. |
| Urge to Feed | BB | Instant | Target creature gets -3/-3 until end of turn. You may tap any number of untapped Vampire creatures you control. If you do, put a +1/+1 counter on each of those Vampires. |
| Tragic Fall | 1B | Instant | Target creature gets -3/-3 until end of turn. Hellbent — That creature gets -13/-13 until end of turn instead if you have no cards in hand. |
| Ana Sanctuary | 2G | Enchantment | At the beginning of your upkeep, if you control a blue or black permanent, target creature gets +1/+1 until end of turn. If you control a blue permanent and a black permanent, that creature gets +5/+5 until end of turn instead. |
| Nuclear Fallout | XBB | Sorcery | Each creature gets twice -X/-X until end of turn. Each player gets X rad counters. |