He is very high up the curve which is the only thing really keeping his rating so low
At the beginning of each upkeep, if this enchantment is on the battlefield, each player creates a 2/2 black Zombie creature token with haste named Tombspawn for each creature card in their graveyard
The two cards, seen below, feature a new Eldritch Moon mechanic called "meld", which - when conditions are met - are both exiled by the mechanic, which in turn puts the combined card onto the battlefield
Just like the inhabitants of the machine hell, get ready to be the bad guy if you choose to rock Grafted Exoskeleton
At best, Chart a Course is a better Nights Whisper, as you dont lose two life for having the ability to draw two cards for two mana and the only extra price is being able to attack with a creature
However, they are both excellent budget options