Your cost of entry is whatever you spend to hit the $15 threshold
Here's the comparison, also from a Scryfall query, with the blue bars being the total amount of cards each year, and the red bars representing the non-reprint cards (therefore, the difference in length represents the reprints): Fact #2: What drove the huge spike of 2022 were reprints
You cast it, look at three cards, decide in what order you want to draw them, or even decide to put them on the bottom of your library if you don't want to draw any of them
Buster Sword appears as a top-tier piece of equipment in the set that costs three mana and gives the equipped creature +3/+2, and it has an equip cost of two mana
I Wont Give In isnt that bad as it can be sung, but there are better options for drawing cards in Amber and Ruby
Unholy Annex deals 2 damage to you each turn, but if you control demons (or changelings), then it becomes a future win condition