{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 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.
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
Rulings · 5
wotc
If your commander is a card that has no colors in its color identity, Opal Palace's last ability produces no mana. It doesn't produce {C}.
wotc
If you don't have a commander, Opal Palace's last ability produces no mana.
wotc
If Opal Palace's last ability produces two mana (most likely due to Mana Reflection) and you spend them to cast a commander, that commander enters with two counters for each time it's been cast from the command zone this game.
Notes
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If you have two commanders, the last ability adds one mana of any color in their combined color identities.
wotc
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.