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 | 
|---|---|---|---|
| Thraben Inspector | W | Creature — Human Soldier | When Thraben Inspector enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") 1/2 | 
| Impending Flux | 2R | Sorcery | Paradox — Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn. Foretell {1}{R}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.) | 
| Giant Ambush Beetle | 3B/GR | Creature — Insect | Haste When Giant Ambush Beetle enters the battlefield, you may have target creature block it this turn if able. 4/3 | 
| Olivia's Midnight Ambush | 1B | Instant | Target creature gets -2/-2 until end of turn. If it's night, that creature gets -13/-13 until end of turn instead. | 
| Chain Reaction | 2RR | Sorcery | Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield. | 
| Rattlechains | 1U | Creature — Spirit | Flash Flying When Rattlechains enters the battlefield, target Spirit gains hexproof until end of turn. You may cast Spirit spells as though they had flash. 2/1 | 
| Follow Him | XUU | Instant — Adventure | Investigate X times. (Then exile this card. You may cast the creature later from exile.) | 
| A-Steadfast Unicorn | W | Creature — Unicorn | {4}{W}: Creatures you control get +1/+1 and gain vigilance until end of turn. Activate only during your turn. 1/2 | 
| Steadfast Unicorn | W | Creature — Unicorn | {3}{W}: Creatures you control get +1/+1 and gain vigilance until end of turn. Activate only during your turn. 1/2 | 
| Whip-Spine Drake | 3UU | Creature — Drake | Flying Morph {2}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) 3/3 |