The first is a triggered ability: "When this permanent enters, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle." Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text
The combination of board presence and card advantage the first two modes present is critical to this cards success
On the other hand, Conclave Tribunal is right up there with the most important cards in the set
So casting removal actions can still set your opponent back in tempo, which could give you the time you need to recover
This allows you to tap all of your Gold tokens to fuel Baylen's abilities and still have them available to sacrifice for even more mana
Each deck is led by a legendary creature - its commander