Fleeting Isle

Fleeting Isle enters with 2 charge counters. When all charge counters are removed from this, exile it, and shuffle it back into its owner’s library at the next end step.

{1}{t}: Add {u} to your mana pool. Place a charge counter
on Fleeting Isle.

Remove all charge counters from Fleeting Isle, {t}: Add {u}
to your mana pool for each charge counter removed.

Nautical charts are futile when the land itself has legs