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Notes: Available only in Planeswalker Decks

Despite these upgrades, the official dimensions remain nearly unchanged

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)

The choice of the creature happens when the trigger is resolving, so there is no way to respond to that choice

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