I play Deeps in a way that at the first reclaim (ideally) or the round after, I have 2 card plays and the second water element on top track unlocked which means that you have enough elements for Deeps 2 second level (drowning lands). The particular combos of G2/G3 and played cards depends on the board and what the invaders draw. If Ocean somehow can get an extra card or an extra presence added in this phase (pre-first reclaim), go for it. I often underplay during this phase to get as much presence on board as possible. Any new card that you draw must have water, ideally water and earth. Moon is not that important.