avonmora
target players fleet reaches all port immediatly for the next day and also target player gets large merchantship and 10 credits

When posting ideas for cards, one needs to think of the consequences as well as the benefits. Sure having our fleet reach each port immediately sounds good in theory, but you have to consider Danger. This might rack up danger making us vulnerable to plunder.

In order to get either a ship or credits from a card, it would have to be extremely rare and would require some sort of sacrifice, be it turns, money, or a combination of both. I can't even begin to think how many turns would be needed to have everything you suggested achieved. In thinking about the cards already in play, Expedition Journey only gives you a level. Where as Tidal wave is the luck of the draw.

I do think this card, with it's cons, would still make the game too easy.

how about the risk being that when this ship is acquired, it automatically gets thrown into a fleet by itself with all of the total danger that all of your other fleets would have gained(i.e. you have 100 travelling fleets when you cast this, you get the ship with 100 danger attached to it...)

rare
money or turns invested every 10 turns

If this card exist why donate? Just store one in inventory, Duplicate it, use one, clean, rinse, and repeat