Cosima, God of the Voyage // The Omenkeel

While the triggered ability Cosima gains is resolving, if you don't put a voyage counter on Cosima, you'll immediately return it to the battlefield and draw cards equal to the number of voyage counters Cosima had on it in exile. Players can't respond to this choice, and no player may take actions during this process.

In the Commander variant, a double-faced card's color identity is determined by the mana costs and mana symbols in the rules text of both faces combined. If either face has a color indicator or basic land type, those are also considered.

A modal double-faced card can't be transformed or be put onto the battlefield transformed. Ignore any instruction to transform a modal double-faced card or to put one onto the battlefield transformed.

You may choose to return Cosima to the battlefield even if it doesn't have any voyage counters on it. If you do, it won't enter with any +1/+1 counters on it and you won't draw any cards.

The mana value of a modal double-faced card is based on the characteristics of the face that's being considered. On the stack and battlefield, consider whichever face is up. In all other zones, consider only the front face. This is different than how the mana value of a transforming double-faced card is determined.

If a land enters the battlefield under your control while Cosima is exiled and has the added triggered ability, that ability will trigger. As the ability tries to resolve, it will check to see if Cosima is still in exile. If Cosima has left exile before the ability tries to resolve, it won't resolve and none of its effects will happen. This is true even if Cosima returns to exile before that ability tries to resolve.