Chelonia, Ferrying Turtle

Dormant 10 (when you play Chelonia, Ferrying Turtle, play it as a land with ten sleep counters on it. At the beginning of each upkeep, remove a sleep counter from Chelonia, Ferrying Turtle. If it has no sleep counters on it, it becomes a creature in addition to any other card types it has.
Pay {1}: Put a sleep counter on Chelonia, Ferrying Turtle. Any opponent may activate this ability. This ability may be activated only once per turn.
Pay {1}: Remove a sleep counter from Chelonia, Ferrying Turtle.