If another player gains control of Lightning, you won't be able to play any of the exiled cards, even if you later regain control of Lightning
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Earth Crystal's first ability)
Magic tabletop, Magic Online, and MTG Arena players all use play boosters
A Great Way To Learn Ultimately, I feel confident in saying that the Lorcana Rise of the Floodborn starter decks achieve what any good start deck should: laying out the game in its most basic form and letting players do the rest of the work to see how much more they want from it
This also means it shuts off notable Cascade cards such as Living End
There's no need to actually sing the song when the card is played, but plenty of players won't be able to resist