Mardu Warshrieker | Creature | Orc Shaman | Raid — When Mardu Warshrieker enters the battlefield, if you attacked this turn, add {R}{W}{B}. | Yefim Kligerman
Ponyback Brigade | Creature | Goblin Warrior | When Ponyback Brigade enters the battlefield or is turned face up, create three 1/1 red Goblin creature tokens.
Morph {2}{R}{W}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) | Mark Zug
Mardu Banner | Artifact | | {T}: Add {R}, {W}, or {B}.
{R}{W}{B}, {T}, Sacrifice Mardu Banner: Draw a card. | Daniel Ljunggren