M:tG card similarity search
1UU · Instant
Counter target spell. If that spell's mana value was 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
| Name | Mana | Type | Text |
|---|---|---|---|
| Dragon Breath | 1R | Enchantment — Aura | Enchant creature Enchanted creature has haste. {R}: Enchanted creature gets +1/+0 until end of turn. When a creature with mana value 6 or greater enters the battlefield, you may return Dragon Breath from your graveyard to the battlefield attached to that creature. |
| Ominous Lockbox | 1U | Artifact — Clue | As Ominous Lockbox enters the battlefield, secretly choose a number between 1 and 20. When an opponent casts a spell with mana value equal to the chosen number, sacrifice Ominous Lockbox. If you do, copy that spell, and you may choose new targets for the copy. {2}, Sacrifice Ominous Lockbox: Draw a card. |
| Sequence Engine | 2G | Artifact | {X}, {T}: Exile target creature card with mana value X from a graveyard. Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it. Activate only as a sorcery. |
| Cephalid Shrine | 1UU | Enchantment | Whenever a player casts a spell, counter that spell unless that player pays {X}, where X is the number of cards in all graveyards with the same name as the spell. |
| Scythe Specter | 4BB | Creature — Specter | Flying Whenever Scythe Specter deals combat damage to a player, each opponent discards a card. Each player who discarded a card with the highest mana value among cards discarded this way loses life equal to that mana value. 4/4 |
| Knight-Errant of Eos | 4W | Creature — Human Knight | Convoke When Knight-Errant of Eos enters the battlefield, look at the top six cards of your library. You may reveal up to two creature cards with mana value X or less from among them, where X is the number of creatures that convoked Knight-Errant of Eos. Put the revealed cards into your hand, then shuffle. 4/4 |
| Break Expectations | B | Sorcery | Target player reveals all cards with mana value 2 or greater in their hand. You choose a card from among those cards. Exile that card. If a card was exiled this way, that player drafts a card from Break Expectations's spellbook and reveals it. |
| Common Courtesy | 2UU | Enchantment | Whenever a player casts a spell without asking your permission while casting it, counter that spell. When a player asks you permission to cast a spell and you refuse, counter that spell and sacrifice Common Courtesy. |
| Disruption Protocol | UU | Instant | As an additional cost to cast this spell, tap an untapped artifact you control or pay {1}. Counter target spell. |
| Cloudkill | 4BB | Sorcery | All creatures get -X/-X until end of turn, where X is the greatest mana value of a commander you own on the battlefield or in the command zone. |