Hah! It should be

Effect: "If your opponent is playing Elementalis they lose."
Flavor: "This has been dragging on for too long..."

Can you locate any Rogue cards that fit this? It seems like a natural matchup.

Name: Dust Devil
Casting Cost: 2
Card Type: Shadow Ally
Effect: Dust Devil gains +1/+1 as long as you control 3 or fewer resources.
Stats: 2/2
Flavor Text: "It thrives where others perish."
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