Fleeting Strike

Fleeting Strike deals 6 damage for 0 cost with Ethereal keyword, meaning it exhausts if not played by turn end. The zero cost makes it great for free damage and triggering card-play effects like Shadow Cloak and Void Resonance. However, the 0.5x scaling means it falls off at higher levels.

Level 3 adds +2 damage and level 5 draws 1 card. The Ethereal self-exhaust triggers Feel No Pain for Block, Dark Harvest for Poison, and Phoenix Feather for energy. Even if you choose not to play it, the exhaust generates value in exhaust-synergy builds.

Shadow element contributes to Shadow synergy for Weakness application. Crystal of Duality adds +3 Block to the free attack. Best in lean, fast-cycling decks that want free plays to trigger Power cards, or in exhaust builds that benefit from the Ethereal self-removal.