That means your opponent has to spend two spells if they want to do something, one removal spell to blow up the Barricade and then whatever their intended spell is
Players other than you and the chosen player may still perform game actions besides casting spells and attacking with creatures: They may block with creatures, activate abilities, perform special actions, and so on
There is no benefit to putting Landfall on Tireless Tracker, since that ability words only purpose in Zendikar was to key people into a major set theme
This Seismic Assault makes sense in a red sort of way (screw the future), even though none of these Vanguard cards are not of a single color
Today it sees play mainly in Charizard ex decks, but may see inclusion in more decks in the future if we keep on seeing Rare Candy decks in the metagame
Artifact Color tag templates(None) Commander's Sphere : Add one mana of any color in your commander's color identity