Giving your team protection is huge, and there are several things you can do to make use of the attack trigger
Blue decks that could certainly play prolonged, traditional control games, but could also just auto-win on Turn 5 by playing a powerful, hard-to-interact with creature that can block until it abruptly turns the corner with protection up
Zellix's tap ability to mill and generate tokens combines perfectly with Haunted One's ability to pump them, and they are joined with a cast of Horror creatures along with plenty of other milling effects
Key Features at a Glance: High-Quality Faux Leather Finish: Durable, textured, and stylish
Five mana for a 4/4 flying and haste Dragon is expected and on curve for today's relevance
These are suitable options whether you care about sniping a specific land like Urza's Tower or Nykthos, Shrine to Nyx, or if you just want to punish that player with 19 nonbasic lands in play