Sunder

Beam Cell

Applying Vulnerable increases Sunder's damage by 50%, significantly lowering the health threshold required to trigger the energy refund. This combination allows for easier execution of high-HP targets in the early and mid-game.

Echo Form

Playing Sunder twice allows for massive burst damage that can potentially kill two separate enemies or one large target. If the first hit kills, the energy is refunded immediately, often allowing for more plays in the same turn.

Pen Nib

Doubling Sunder's damage on the 10th attack creates a massive 48-damage nuke that almost guarantees a kill on non-boss enemies. This synergy ensures the energy gain triggers reliably even against high-health elites.

Hologram

Hologram can retrieve Sunder from the discard pile after it has been used to kill an enemy. Because Sunder refunds its own cost, you can effectively chain multiple Sunder plays in a single turn if you have the card draw or retrieval to support it.

Bag of Marbles

The turn-one Vulnerable application allows Sunder to deal 36 damage immediately at the start of combat. This is often enough to instantly remove a minion or small enemy, providing a massive energy boost for the rest of your opening turn.