The four-mana human cleric is a very unique creature with a lot of text
Even if you only get one Enrage trigger, the value Stalwart Speartail provides is immense and well worth the three mana cost
There are plenty of ways to win without creature damage in Magic, especially in a format like Commander
Making a token draws you a card, and since it can trigger each turn, you have the potential to draw a ton of cards thanks to instant-speed token generation
Theres a lot of card draw/advantage in the deck, but much of it is on expensive cards like Sunbirds InvocationSunbirds Invocation and Coveted JewelCoveted Jewel, so you cant rely on cheap card draw to find your ramp in the early game
and if for some reason you decide to later in the game, swinging with him boosts your horde of undead the turn he comes down because he has haste