Magic Dashboard

Commander’s Sphere

{T}: Add one mana of any color in your commander’s color identity.
Sacrifice Commander’s Sphere: Draw a card.

Rarity : Common
Types : Artifact
Artist : Ryan Alexander Lee
Flavor : It harmonizes with the essence of its master.
Cost converted to mana : 3

Rulings

7 November 2014
The color identity of your commander is set before the game begins and doesn’t change during the game, even if your commander is in a hidden zone (such as your hand or your library) or if an effect changes your commander’s color.
7 November 2014
If your commander has no colors in its color identity, Commander’s Sphere produces no mana.
7 November 2014
In formats other than Commander, Commander’s Sphere produces no mana.

Boros Signet

{1}, {T}: Add {R}{W}.

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.