Mystic Sentry

The Mystic Sentry is a huge, everlasting sentry with a range of 300px.      300px    It fires a purple, constant beam with infinite pierce, but drains 1HP from each tower for every round it doesn't take any damage. If it has full HP and drains HP from towers, then it will get converted into Golden Shards. For every 7 rounds in a row it attacks, the chances of a Dealer appearing double. It has 70 HP, and if given a Mystic Shard to hold, the shard disappears and it gains +2 HP. The beam does 20 damage to each bloon hit and drains 50 HP if the bloon survives. It costs 500 Mystic Shards to build