It's what's called a saboteur effect, one that triggers when the creature hits an opponent
As good as these cards would be in fair blue decks, theyre even better in almost every combo deck
Depending on your deck, you might also want to look at Clever Concealment, Flawless Maneuver and Cosmic Intervention the latter of which is a lot of fun with fetchlands and mass land destruction, or board wipes when you run a lot of strong EtB effects
This celebratory box set contains collectible items, booster packs (which include 25 new cards and 25 reprints from past series) and two commemorative metal cards
Decks like this play fewer lands since they only need a few for the whole deck to work like a well-oiled machine
Lords are one of MTGs best build-around cards, as all you need to do is surround it with creatures from that type and reap the rewards