The process of setting everything up is known as make ready and during this process tons of waste sheets are printed
We had already seen Shiva, but the panel gave us a peek at two more: Esper Valigarmanda, and Bahamut
It doesnt carry any inherent meaning
Another gem from all the way back in 2002, Chainer's Edict was often able to take out the opponent's best creature, because that was all they'd have in play when you were casting it
From the leaks so far, Boost looks like its related to the Shift ability
A bunch of card draw can be great if you have good devotion to red, and with haste and read ahead you could do dumb funny loops by just injecting a bit more mana like a Jeskai spell slinger deck, but it's so many moving pieces to do something that's not actually that great