mtg katara card Magic The Gathering - Avatar The Last Airbender (While paying a waterbend cost 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 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

Back Sea Gate, Reborn As Sea Gate, Reborn enters the battlefield, you may pay 3 life

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

This is a good defensive card but as such it is a little late in the day