Nebula
$2 - Action - Traveller
Trash a card from your hand. Gain a Copper to your hand.
When you discard this from play, you may exchange it for a Main Sequence Star.
Main Sequence Star
$3 - Action - Traveller
You may trash 2 Coppers from your hand to gain a Silver.
When you discard this from play, you may exchange it for a Giant Star.
Giant Star
$4 - Action - Traveller
Trash up to 2 cards from your hand. Gain a card costing up to $4.
When you discard this from play, you may exchange it for a Supernova.
Supernova
$5 - Action - Attack - Traveller
Each player (including you) discards down to 3 cards in hand. +5 Cards.
When you discard this from play, you may exchange it for a Black Hole.
Black Hole
$6 - Action - Attack - Traveller
Each other player reveals cards from their deck until they reveal one costing $3 or more. They then return all of the revealed cards to the box (they cannot be gained for the rest of the game). For the rest of your turn, when you play a card, you may play it again if you have not already done so.
When you discard this from play, you may exchange it for a Wormhole.
Wormhole
$7 - Action - Traveller
Gain a card costing up to $6. This is that card until it leaves play.