Masta' Trappa' Musa sparkles orange to signal his upgrade bonus. Hunter Secrets in your hand also sparkle orange; mousing over them highlights the words/stats (between asterisks) affected by his bonus.
Once an upgraded Secret is played, it won’t lose its bonus when Musa dies or leaves the battlefield.
Click the Spoiler below to preview every upgraded Secret .
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One cool thing here is that it's not "after you play a rogue secret..." but any secret including the one you just discovered. So you could have him and only one secret in your hand and then go full Christmas tree on a late turn, or several early turns if the opponent doesn't deal with him.