shadowless pokemon cards meaning How to tell vs Shadow Blastoise Unlimited (Non Shadowless) Shadowless vs. Unlimited: The Grading

This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)

It is better to buy the 690 Poke Gold bundle if you want the best value for your money

The restriction that only land creatures can attack applies only to the combat phase created by Bumi, Unleashed, not to any other combat phases that might occur that turn

To get good returns on this it is really a five drop card you immediately follow with a land, ideally a sac land