This is a very cheap and effective way of turning on each of your creatures with islandwalk and letting your merfolk through your opponents' defenses unopposed
The answers to these will help guide you more
Your opponents spells essentially costs 1 more to cast because a colorless mana has to be paid to negate Chancellor of the Annexs effect of countering spells
The Apex cats (Nethroi, Apex of Death, Vadrok, Apex of Thunder, and Snapdax, Apex of the Hunt) all have mutate, but they cant be played together unless theyre in a deck lead by another commander
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Card Draw The last few slots I wanted to make room for some card drawing, especially ones that can keep you hitting early land drops like Nights Whisper and Read the Bones