Mushroom Spore Cloud

When this card is played add one "mushroom counter" to any land in play except "Mushroom Forest". Whenever a land contains one or more mushroom counters, that land becomes a colorless {c} "Mushroom Forest" land with the effect: "Whenever this card is tapped, add a mushroom counter to any land in play except "Mushroom Forest". If there are no lands in play other than Mushroom Forest then add the counter to any card in play. If any card has more than 6 mushroom counters, destroy that card."