Hand manipulation is an interesting layer for any card game meta because it forces players to make tough decisions
We've got the decklists for all four of the Commander decks right here
Maxxing out Valgavoth The key feature this guide wants to focus on is Valgavoths final ability, Whenever an opponent loses life for the first time during each of their turns, put a +1/+1 counter on Valgavoth, Harrower of Souls and draw a card. Not only does this give us some nice card draw, allowing us to manage whats in our hand, but it allows us to grow the commander into a truly terrifying flier
Be not afraid of the holy chorus
Coralhelm Commander Coralhelm Commander starts out as a simple 2/2 for 2 mana, but with level up, it quickly grows into a flying threatand more importantly, at level 4 or higher, it pumps all your other merfolk with a +1/+1 bonus