M:tG card similarity search
1U · Creature — Siren
Flash Flying When Threnody Singer enters the battlefield, target creature an opponent controls gets -X/-0 until end of turn, where X is your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) 1/3
| Name | Mana | Type | Text | 
|---|---|---|---|
| Serene Sleuth | 1W | Creature — Human Detective | When Serene Sleuth enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") At the beginning of combat on your turn, investigate for each goaded creature you control. Then each creature you control is no longer goaded. 2/2 | 
| Water Servant | 2UU | Creature — Elemental | {U}: Water Servant gets +1/-1 until end of turn. {U}: Water Servant gets -1/+1 until end of turn. 3/4 | 
| Dictate of Heliod | 3WW | Enchantment | Flash Creatures you control get +2/+2. | 
| Heir to Dragonfire | 1R | Creature — Human Warlock | {R}: Heir to Dragonfire gets +1/+0 until end of turn. {2}{R}, Reveal Heir to Dragonfire from your hand: Heir to Dragonfire perpetually becomes a Dragon, gets +3/+3, and gains flying. 2/2 | 
| Storm Fleet Aerialist | 1U | Creature — Human Pirate | Flying Raid — Storm Fleet Aerialist enters the battlefield with a +1/+1 counter on it if you attacked this turn. 1/2 | 
| Healer's Flock | WWW | Creature — Bird | Flying, lifelink 3/3 | 
| Healer's Hawk | W | Creature — Bird | Flying, lifelink 1/1 | 
| Curry Favor | B | Sorcery — Adventure | You gain X life and each opponent loses X life, where X is the number of Knights you control. | 
| Gust Walker | 1W | Creature — Human Wizard | You may exert Gust Walker as it attacks. When you do, it gets +1/+1 and gains flying until end of turn. (An exerted creature won't untap during your next untap step.) 2/2 | 
| Skemfar Shadowsage | 3B | Creature — Elf Cleric | When Skemfar Shadowsage enters the battlefield, choose one — • Each opponent loses X life, where X is the greatest number of creatures you control that have a creature type in common. • You gain X life, where X is the greatest number of creatures you control that have a creature type in common. 2/5 |