Mulligans
General Mulligans
I'd imagine sonya and toy boat are always keeps, probably keep dig/shovel and maybe raiding although possibly too greedy.
Typical Pirate draw engine with weapon finisher. Works without sonya bug present in theorycrafting.
(4) Sonya–> (1) sandbox 1/1—> (1) cover artist—> (0) cover artist —> (4) deadlypoison/gift for damage
Totals to 10 mana for +24 on weapon and only costs 1x gift due to the 3 sonyas on board, can go much higher with steps on prior turns giving mana discount.
A lot of redundancy on the poisons means you can be liberal with using them early which makes dread corsair decent and gives a lot of early chip.
Quickpick might be better than shovel but shovel being 1 mana gives you some outs to disruption with generating scorp using sonya, might be meme but hey.
Deafen allows for you to get through basically any taunt as you generate more with sonya on board.
No prep as its basically only useful with raiding party.
Swashburglar might be ok but i think it probably just clutters your hand, dread is just a better 1 cost with weapon + deadly.