While perhaps different now thanks to the London mulligan rule, in the past, people have calculated that your odds of winning when you mulligan to six (so starting with one less card than your opponent) is 40%, which might not sound like a lot, but considering that the odds are 50/50 with each player starting with an equal number of cards in hand, it's actually a 20% shift in your chances of winning the game
These lands are great and will be used from now until the end of time
Day of the Dragons is pricey in terms of casting cost, but does triple duty here: it almost always upgrades the stats of your creatures, it protects your team from a board wipe, and you can bounce it with something like Blink of an Eye to flash your team back in and trigger their abilities at instant speed
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You gain 1 life for each creature card exiled this way
Sure, you might never draw it, but you don't know that