Cosmic Encounter - PBP: Deep Space Water

Here's the link to my quicktopic in case anyone cares about what I was thinking behind the scenes at any given point.

I spend most of the first half of the game with absolutely nothing but attack and negotiate cards, and so I was super annoyed when it spun around back to my turn and I got two purple cards in a row.

Granola, what gave it away that I had the morph card?