Sea Drake

Flying
When this creature enters, return two target lands you control to their owner's hand.

Highly territorial, they often attack boats whose colors too closely resemble those of other drakes.

Modern Horizons 2

Vintage Masters

Flying
When Sea Drake enters the battlefield, return two target lands you control to their owner's hand.

Masters Edition II

Flying
When Sea Drake comes into play, return two target lands you control to their owner's hand.

Portal Second Age

Flying
When Sea Drake comes into play from your hand, return any two of your lands from play to your hand.

Although you must choose two lands you control as the targets of Sea Drake's triggered ability, there is no consequence to Sea Drake if the ability doesn't resolve. If one of the lands becomes an illegal target in response, the remaining legal target will be returned to its owner's hand. If both targets have become illegal in response, nothing happens.

If you can't target two lands you control with the triggered ability (perhaps because you control fewer than two lands), the ability will be removed from the stack. You won't return any lands. There is no consequence for this.