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 their library." (6/16/2023) 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
There is no secondary market for Arena, but overall it should be cheaper since you cant pay huge amounts of money for the most powerful cards second-hand
This provides an additional source of value, potentially allowing Ramirez DePietro to provide mana ramp when paired with flickering effects
I like this one in decks like Isshin, or in red decks that want to ramp lands out
Could the price on the foil copy climbing even as more packs get opened (I mean, War of the Spark was 5 expansion sets ago, were already on to Core 2020) be due in part to Oathbreaker