mtg katara card Magic The Gathering - Avatar The Last Airbender that ability triggers an additional time.rareLegendary Creature — Human Warrior AllyFrom the Magic Katara, 9 cards | Magic:

If the gift was promised, all permanents you control phase out, and until your next turn, your life total can't change and you gain protection from everything.Exile Perch Protection

As a card, Esika's Chariot is also rather awesome

As for commanders, youre spoiled for choice

While is pretty steep for a 5/3 creature, when it enters, its first chapter destroys target creature a foe controls, its second chapter is the your foe loses the game one, which is obviously awesome, and the third chapter draws you two cards and forces all players to lose two life

We wont always have it but a 1-2 punch with Path to Exile or Swords to Plowshares does the trick

While I dont think theres any rush to go buy out the internet before they spike tomorrow (as you can see, I tweeted the above over a month ago and have seen next to zero gains), its something that I would get in on sooner rather than later if you plan on playing the deck, and something I would hold back on buylisting for now if youre comfortable with waiting into the long term for larger rewards