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Opal Palace

{T}: Add {C}.
{1}, {T}: Add one mana of any color in your commander’s color identity. If you spend this mana to cast your commander, it enters the battlefield with a number of additional +1/+1 counters on it equal to the number of times it’s been cast from the command zone this game.

Rarity : Common
Types : Land
Artist : Andreas Rocha
Cost converted to mana : 0

Rulings

17 October 2013
The “number of times it’s been cast from the command zone” includes the most recent time. For example, the first time you cast your commander from the command zone in a game, if you spent mana from Opal Palace’s last ability to do so, it will enter the battlefield with a +1/+1 counter.
17 October 2013
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 (like the hand or library) or an effect changes your commander’s color.
17 October 2013
If your commander is a card like Kozilek, Butcher of Truth that has no colors in its color identity, Opal Palace’s last ability produces no mana.
17 October 2013
In formats other than Commander, Opal Palace’s last ability produces no mana.

Ash Barrens

{T}: Add {C}. Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, and put it into your hand, then shuffle your library.)

Boros Signet

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