If your deck is full of cards like Fauna Shaman and Chord of Calling so you have a lot of access to single copies of utility creatures in your deck, theres a lot of extra value to each extra bullet you can fit, and on top of that, the more narrow bullets you put in, the less you want the odds of accidentally drawing one of them to be, so the more cards you have, the less likely your are to draw a narrow bullet that youre hoping to only see when you search for it
(A creature with daunt can't be blocked by creatures with power 2 or less
X Speed makes Retreat cost one Energy less
The problem with monarch is making sure you can keep the crown
Otherwise, if you want to capitalize on vintage Pokmon cards values by selling your old collection or hunting for a rare old-school card, shop with Danireon
Thrill of Possibility is a two-mana instant that allows you to discard one card while drawing two more