Whenever Aisha deals combat damage, you may cast a sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost
Alongside Thought Vessel, Id say its good to pick up a copy of Reliquary Tower
Your speed doesn't change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn
The world nurtures your creatures by letting you cast them, which nurture the land in turn so it taps for more mana and both flourish in harmony with each other
The activated ability forces opposing players to give you extra combats, making for an aggressive Gruul deck
I hope Wizards continues to tweak them as I havent encountered any truly egregious sealed pools, but I do hear the discussion about how Play Boosters have increased the randomness of limited gameplay in negative ways