Giving your team protection is huge, and there are several things you can do to make use of the attack trigger
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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
It set the tone for Blue's ability to accrue raw card advantage
Snake Umbra gives you another chance to keep your board alive with umbra armor and provides a nice card advantage bonus for combat damage
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