Jace, Multiverse Architect

At the beginning of combat on each opponent's turn, they may pay {2}. If they don't, creatures they control can't attack Jaces you control this turn.
+1: Draw two cards, then put a card from your hand on the bottom of your library.
−3: Exile another target planeswalker or creature you control. Reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
Jace, Multiverse Architect can be your commander.

Niv-Mizzet, Ghost Counsel

Flying
Whenever you gain life, you may pay that much life. If you do, draw that many cards.
{T}: Each opponent loses 1 life and you gain 1 life.

Memnarch, the Warden

Indestructible
When Memnarch enters, create two 1/1 colorless Myr artifact creature tokens.
Whenever Memnarch attacks, draw a card for each artifact you control.

Turbulent Crater

({T}: Add {B} or {R}.)
This land enters tapped unless your opponents control eight or more lands.

Turbulent Shore

({T}: Add {W} or {U}.)
This land enters tapped unless your opponents control eight or more lands.

Turbulent Wetlands

({T}: Add {U} or {B}.)
This land enters tapped unless your opponents control eight or more lands.

Tamiyo, Upriser Crowned

Flying, double strike, haste
When Tamiyo enters, you become the monarch.
Whenever one or more creatures deal combat damage to you while you're the monarch, tap those creatures and put a stun counter on each of them.

The Ur-Sphinx

Eminence — As long as The Ur-Sphinx is in the command zone or on the battlefield, other Sphinx spells you cast cost {1} less to cast.
Flying
Whenever one or more Sphinxes you control attack, each player mills that many cards. For each player, you may cast a card that player milled this way without paying its mana cost.

Darksteel Angel

Flying, indestructible
You can't lose the game and your opponents can't win the game.
Creatures you control can't have -1/-1 counters put on them.

Ginger, Queen of Sweets

Gingerbrute Token

When Ginger enters, you become the monarch.
{2}, {T}, Sacrifice Ginger: You gain 6 life.
At the beginning of each upkeep, if you're the monarch, create a Gingerbrute token. (It's a {1} 1/1 Food Golem artifact creature with haste, "{1}: This token can't be blocked this turn except by creatures with haste," and "{2}, {T}, Sacrifice this token: You gain 3 life.")

Akroma, Angel of Fury

Morph

This spell can't be countered.
Flying, trample, protection from white and from blue
{R}: Akroma gets +1/+0 until end of turn.
Morph {3}{R}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn her face up any time for her morph cost.)

Nissa, Leyline Tamer

Deathtouch, vigilance
Landfall — Whenever a land you control enters, draw a card. Then if this is the first time this ability has resolved this turn, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

Reality Fracture Commander