For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Sin's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
The more margin, the more you can potentially make but also it cushions you for reality of flipping cards on the market and the potential of large, sudden price swings (which happen a lot in new modern sets) and the impact of Ebay, TCGPlayer fees
If youre looking for the lowest "in-stock" price right now, direct from a major retailer, Amazon leads the pack at $38.99
U/W/R Delver is not well equipped at all to deal with the threat that Miracles represents, so thats why I will keep this short
You discard one or more cards of your choice
Inkjet printers are generally hailed as good options