The best cards from Commander Masters could be a list of all of the reprints in the main Magic: The Gathering set, but because its already pretty well-documented which cards are good and which are bad - and in a Masters set most of the cards are at least some degree of good - were going to be looking at just the new cards added in by the new, and uncomfortably pricey, Commander decks
1 Kolvori, God of Kinship
So, lets say you cast Phantasmal Image and you copy your opponents Boros Reckoner
3/3 haste for 3 is an okay rate, and if the card is dealt damage once, it can shut down their lifegain for the rest of the game
Which, in turn, is often the key to winning, so a ton of decks include card drawing not because of any specific payoff for playing something that says draw, but because drawing cards is one of the most powerful things to do in Magic