Preacher of the Schism was the best overall one although it can be unreliable, because it sometimes only makes 1/1s when that is not useful, the ceiling is very high and the combination of defensive utility and card drawing that just gets you the resources you need to function is more valuable than anything else other 3-drops can provide
I cant get into a full deck tech here, but suffice to say its incredibly fun and pretty strong without quite approaching cEDH territory
The other is a new card, but one that wont be legal in normal play
But if you are a beginner player, any one of the starter decks can get you playing right away and then the deck building strategies can come later
$9.79 $2.99 $3.73 $8.99 $9.93 Currently, many cards are still fluctuating in value as the set is in its pre-release season
The best zombie commander in MTG depends on playstyle, but Wilhelt, the Rotcleaver is widely considered the most consistent option