I decided to have some fun with the sideboard and keep it to a theme, that being ‘free’ alternate casting costs for all spells within. Simply have a little faith and
”…say unto this mountain, ‘Remove hence to yonder place’; and it shall remove” from the table to the graveyard, enabling the casting of a spell without spending one red pip.
•Crash smashes artifacts like nobody’s business.
•Thunderclap is mighty fine creature removal.
•Fireblast can be used as stronger removal or can target the opponent directly. Very surprising, and quite the game ending finisher.
•Downhill Charge is a wonderful augmentation spell, somewhere between an Assault Strobe and a Temur Battle Rage that can be played for ‘free’. Not bad!
Yes there are better sideboard choices but this sub theme was simply more fun for me to build around. If you’re concerned with having answers for games two and three, there are plenty of Prowess decks out there to glean ideas from.