If you are a "kitchen table" player with a group of friends, try buying a complete playset of commons/uncommons for each set that comes out (4x of each card.) This will typically run around $20-30 on ebay and yet greatly expand your collection
April O'Neil, Kunoichi Trainee
Theres been some really fun customs like the ones you mentioned, or the collaborations with sport teams, or even E4 art prizes being in that realm
Though Reconnaissance Mission and Bident of Thassa are effectively strictly better versions of Coastal Piracy, a deck that wants one will usually benefit from all three
With enough fuel, a single Breach turn can spiral into a full combo chain
Free spells aplenty, maximal interaction and if you give it a moment to combo off, it will