Not only does it improve your draws, it also ramps you and draws you a card when you need it for just a Treasure token
Then they shuffle each nonland permanent they control into its owner's library
Selvala, Heart of the Wilds can bite you in the butt sometimes when your opponents cast bigger creatures, but I dont think thats going to happen very much here
The Reserved List, for those not in the know, is a list of cards that can never be reprinted
Swordsworn Cavalier will continue to have first strike even if the other Knight that entered the battlefield that turn has since left the battlefield, has since stopped being a Knight, or another player has gained control of it
If you have to you can activate one of it's three abilities, each of which give one of your opponents a handy dandy boost