Digital Destiny's Nexus

You may only cast Digital Destiny's Nexus if you control a Legendary Creature or a creature with a +1/+1 counter on it, representing a Digimon ready for Digivolution.
Effect: Take two extra turns after this one. During those turns, lands you control produce an additional {u}, {r}, or {g} when tapped. At the beginning of the first extra turn, choose up to one creature. Double the number of +1/+1 counters on it, then search your library for a creature card with a higher mana cost, reveal it, and put it in