Putting +1/+1 counters on all of your creatures, putting lands onto the battlefield, and drawing cards thanks to Enrage are all pretty powerful abilities and shouldnt be all that hard to trigger
Drawing two cards from an empty hand is interesting, but might not come up too much in practice outside of specific strategies
Sprouting Vines is a ramp tool that lets you search your deck for basic lands and put them into your hand
At the beginning of the chosen players upkeep, The Rack deals X damage to that player, where X is 3 minus the number of cards in their hand
A dedicated sacrifice deck would probably just rather have him as the commander, though
(If a permanent with a stun counter would become untapped, remove one from it instead.) You may target a creature that is already tapped with Tranquilize