Your lands activated abilities all cost one less to activate, and then any land creatures you control get +1/+1
A Replica of 1 of the world's most popular and expensive Pokmon cards, the 1st Edition (Shadowless) English Base Set Charizard (4/102)
But hey, the Equipment destruction angle does mean that you get to trade 1-for-1 in that situation, and thats not too bad on top of all the other things that this can allow
Not only do you draw a card, but you can immediately cast a spell from your hand with mana value equal to or less than the damage dealt, without paying its cost
Have you ever tried to watch a comic-book-hero movie after watching a few episodes of Game of Thrones
Hour of Promise gives you some extra Zombies if you put some Deserts in your deck, but it also lets you get any land that you want, if you wanted to get something like a Maze of Ith for early defense or a Dark Depths for a combo with Vampire Hexmage