There are 8 uncommon, 7 rare, 5 mythic rare Treasure Trove cards
Will access to Persist mean that this has a role in Modern, where there are bad Dimir control decks using Grief
The first is a triggered ability: "When this permanent enters the battlefield, 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
This request came from Anthony Stebel, a reader who appears to have made a Twitter account to get a hold of me, and I am sorry for missing your message
Theyre a five mana Blue and Red 4/3 with flying, which is really useful given their ability