Whoever said Sun God wasn't worth it never got past level 75, because at the highest levels, you need as much firepower as you can pack in there, and MOAB Maulers can't hold a candle to Sun Gods in terms of raw damage per space. The SGs fire 20x faster than the Maulers, not to mention the Maulers are only somewhat effective against BFBs and MOABs, marginally effective against most other bloon types, and completely ineffective against blacks and zebras.
My suggestion: Skip the magic. Go all in on troop enhancements and XP buff. I'm laying absolute waste to it right now with near max defense, offense, speed, agility, and +XP.
Got the 3, was fun, but I'm not fond of games that require an enormous amount of early luck to succeed. If you don't have enough for radar and fuel sucker on day 2, it's not going to happen.
Legend acheivement can only be unlocked by playing on heroic, and never doing training fights or re-fighting already defeated bosses.
It's a pain in the neck. I'm still trying...
Talk about predictable: Draw the opposing hero out with a comet as soon as you can get one. No matter what your army is composed of, you will slaughter him. After that, it's just a matter of enough ranged attacks + some cannon fodder to win - ANY battle, ANY difficulty (except Cave #5, still working on that one)