M:tG card similarity search
2R · Legendary Creature — Dragon Shaman
Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value. Choose a Background (You can have a Background as a second commander.) 1/3
| Name | Mana | Type | Text | 
|---|---|---|---|
| Ovika, Enigma Goliath | 5UR | Legendary Creature — Phyrexian Nightmare | Flying Ward—{3}, Pay 3 life. Whenever you cast a noncreature spell, create X 1/1 red Phyrexian Goblin creature tokens, where X is the mana value of that spell. They gain haste until end of turn. 6/6 | 
| Accelerated Mutation | 3GG | Instant | Target creature gets +X/+X until end of turn, where X is the highest mana value among permanents you control. | 
| Kaervek the Merciless | 5BR | Legendary Creature — Human Shaman | Whenever an opponent casts a spell, Kaervek the Merciless deals damage equal to that spell's mana value to any target. 5/4 | 
| Lavinia, Azorius Renegade | WU | Legendary Creature — Human Soldier | Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls. Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell. 2/2 | 
| Hedron Matrix | 4 | Artifact — Equipment | Equipped creature gets +X/+X, where X is its mana value. Equip {4} | 
| Rage Extractor | 4R/P | Artifact | ({R/P} can be paid with either {R} or 2 life.) Whenever you cast a spell with {P} in its mana cost, Rage Extractor deals damage equal to that spell's mana value to any target. | 
| Leering Emblem | 2 | Artifact — Equipment | Whenever you cast a spell, equipped creature gets +2/+2 until end of turn. Equip {2} | 
| Skyfire Kirin | 2RR | Legendary Creature — Kirin Spirit | Flying Whenever you cast a Spirit or Arcane spell, you may gain control of target creature with that spell's mana value until end of turn. 3/3 | 
| Imoti, Celebrant of Bounty | 3GU | Legendary Creature — Naga Druid | Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.) Spells you cast with mana value 6 or greater have cascade. 3/1 | 
| Spell Swindle | 3UU | Instant | Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.") |