Right now Aquatic creatures are rather weak compared to other creatures. While in future expansions there could be cards that would make aquatic keyword more viable, I think there should be something done right now.
My proposal: make it possible to summon aquatic creatures at the ocean tiles adjustment to your lands.
This would fit aquatic creatures flavor-wise, wouldn’t make them much stronger overall, but would allow some interesting plays. You could gather Faeria with aquatic creatures a bit more faster, as you could summon them a tile away from your lands. And you could summon aquatic creatures almost everywhere where you have lands, which could sometimes be really handy.
I saw a lot of other proposals and reworkings of
aquatic keyword, but a lot of those are either too strong and would follow in more balance adjustments (like I once proposed an ability to create lands near your aquatic creatures when they’re in the ocean), or too complex (like having then charge 2 when in ocean/lakes and like half of a movement on normal lands, similar to how ranged move). The ability to summon them near your lands then seems rather easy and interesting.
If anyone have other ideas on how aquatic creatures could be buffed, or why my proposed addition is OP, feel free to comment!