The First Sliver

T: Add C. T: Add one mana of any color. Spend this mana only to cast your second spell in a turn. When that mana is spent, create a Deep Dish Pizza token. (It's a Food artifact with "3, T, Sacrifice this token: You gain 3 life and draw a card.")

First strike, menace, trample Partner (You can have two commanders if both have partner.)

Flying Whenever this creature or another Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control. R: This creature gets +1/+0 until end of turn.

T: Add W.

When Sokka enters, discard up to two cards, then draw that many cards. Whenever you cast an artifact or Lesson spell, put a +1/+1 counter on Sokka.

Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost 1 less to cast. Flying Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.

T: Add one mana of any color in your commander's color identity.

When J. Jonah Jameson enters, suspect up to one target creature. (A suspected creature has menace and can't block.) Whenever a creature you control with menace attacks, create a Treasure token.