M:tG card similarity search
3 · Artifact
As Herald's Horn enters the battlefield, choose a creature type. Creature spells you cast of the chosen type cost {1} less to cast. At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.
| Name | Mana | Type | Text |
|---|---|---|---|
| Giant Slug | 1B | Creature — Slug | {5}: At the beginning of your next upkeep, choose a basic land type. Giant Slug gains landwalk of the chosen type until the end of that turn. (It can't be blocked as long as defending player controls a land of that type.) 1/1 |
| World Queller | 3WW | Creature — Avatar | At the beginning of your upkeep, you may choose a card type. If you do, each player sacrifices a permanent of that type. 4/4 |
| Unnatural Selection | 1U | Enchantment | {1}: Choose a creature type other than Wall. Target creature becomes that type until end of turn. |
| Tsabo's Decree | 5B | Instant | Choose a creature type. Target player reveals their hand and discards all creature cards of that type. Then destroy all creatures of that type that player controls. They can't be regenerated. |
| Mistform Mutant | 4UU | Creature — Illusion Mutant | {1}{U}: Choose a creature type other than Wall. Target creature becomes that type until end of turn. 3/4 |
| Cloud Key | 3 | Artifact | As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast. |
| Mirror of the Forebears | 2 | Artifact | As Mirror of the Forebears enters the battlefield, choose a creature type. {1}: Until end of turn, Mirror of the Forebears becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types. |
| Crippling Fear | 2BB | Sorcery | Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn. |
| Distant Melody | 3U | Sorcery | Choose a creature type. Draw a card for each permanent you control of that type. |
| Shimmer | 2UU | Enchantment | As Shimmer enters the battlefield, choose a land type. Each land of the chosen type has phasing. (It phases in or out before its controller untaps during each of their untap steps. While it's phased out, it's treated as though it doesn't exist.) |