San Diego Comic-Con 2017

[+1]: Until your next turn, prevent all damage target permanent would deal. [0]: Until end of turn, Gideon becomes a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn. [0]: You get an emblem with "As long as you control a Gideon planeswalker, you can't lose the game and your opponents can't win the game."

[+1]: Scry 1, then draw a card. [−2]: Return target creature to its owner's hand. [−8]: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell."

[+1]: Create a 2/2 black Zombie creature token. Mill two cards. [−3]: Return target creature card from your graveyard to the battlefield. That creature is a black Zombie in addition to its other colors and types. [−7]: Destroy all non-Zombie creatures.

[+1]: Exile the top card of your library. You may cast that card. If you don't, Chandra deals 2 damage to each opponent. [+1]: Add {R}{R}. [−3]: Chandra deals 4 damage to target creature. [−7]: You get an emblem with "Whenever you cast a spell, this emblem deals 5 damage to any target."

[+2]: Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost. [+1]: Each opponent exiles two cards from their hand. [−4]: Nicol Bolas deals 7 damage to target opponent, creature an opponent controls, or planeswalker an opponent controls. [−12]: Exile each nonland permanent your opponents control.

[+2]: Scry 2. [0]: Look at the top card of your library. If it's a land card or a creature card with mana value less than or equal to the number of loyalty counters on Nissa, you may put that card onto the battlefield. [−6]: Untap up to two target lands you control. They become 5/5 Elemental creatures with flying and haste until end of turn. They're still lands.