Black Hole

Regent

A — Strong

PowerUncommon1 ⚡

Whenever you spend or gain a Star, deal 3 damage to ALL enemies.

Why A-tier:

Turns Star churn into constant AoE — a passive that ends multi-enemy rooms on its own.

Best with:

Genesis, The Sealed Throne, Star ramp

Regent Star engine

Black Hole is a payoff only when Stars keep moving

Black Hole turns every Star gained or spent into area damage. Treat it as a payoff for repeated Star churn, not as a standalone damage Power.

The deck already gains or spends Stars several times per fight, so Black Hole starts dealing damage without extra setup.
Upcoming rooms reward repeated area damage and the deck can afford a Power turn without falling behind on Block.
The Regent plan wants passive damage while other cards handle draw, defense, or Star conversion.

The deck has only one-off Star text and no reliable way to trigger Black Hole more than once or twice.
The next threat is a single large hit where a slow Power does not solve the danger turn.
Taking another payoff would crowd out the draw, energy, or Block needed to make the Star engine run.

Against multi-enemy rooms, Black Hole can convert normal Star turns into meaningful cleanup damage.
Against Aeonglass, it is strongest when one high-value turn triggers several Star events without bloating the card-play count.
Against Corrupt Heart, the card needs compressed trigger turns; low-impact extra plays can lose more life than the damage returns.

Counting every created card as Star support instead of checking whether Stars are actually gained or spent.
Playing the Power before covering the turn’s incoming damage.
Drafting Black Hole as the deck’s first Star card and expecting it to create its own engine.