Your pawns grow toward the light: after every 3 of your turns, one of your pawns advances one square on its own (the pawn nearest promotion that has an empty square ahead). It never auto-advances onto the promotion rank.
You draft Photosynthesis in Buff mode. Passive: it works on its own the whole time you hold it, with nothing to activate.
As a tempo card, it buys time: an extra move, a skip, or a freeze.
“Just add sunlight.”
Affects your pawns.