Burst

Burst is a rare Silent skill that causes your next 2 Skills played this turn to be played twice, costing 1 Energy. Effectively, the next two Skills each fire their effect doubled — two Deadly Poisons become four applications, two Blurs become four Block stacks that persist. The doubling effect can turn any two Skills into extraordinary value, especially when high-impact rare Skills are targeted.

Burst's power scales dramatically with what Skills follow it. The ceiling is enormous: Burst into two Catalysts triples-then-triples Poison (9x multiplier), Burst into two Nightmare adds 6 copies of a card, Burst into Crippling Cloud applies double Poison and double Weak to all enemies. Even pairing it with two modest Skills usually provides exceptional efficiency. Upgraded, the next 3 Skills are played twice instead of 2, pushing the potential even higher.