World Turtle

This spell can't be countered, Gift of greater immortality. (If this card is exiled or sent to the grave yard put it back on the battlefield tapped.)

When this creature enters the battlefield put ten time counters on this creature. while the time counters are on this creature it's a land and can be {t} for {g}{c}{w}
(still works when it's a creature)

Land fall
when a land enters the battlefield under your control remove one time counter from this card.