Obosh deck more focused on the prowess mechanic than grind (a bit budget too).
Bomat Courier can draw you a lot of gas if not interacted with. Usually only leave mana open for it if it have exile more cards than you have in your hand or in case the cards in your hand are not helpful.
Blistercoil Weird is a weird choice compared to Soul-Scar Mage since the later have +1 toughness, the untap can help in some cases and the double color from Blistercoil can help against General Ferrous Rokiric, but corner cases aside you can just swap it for the SSM.
Flex slots:
Saheeli, Sublime Artificer's tokens can be quite helful and her ability can make a copy of a prowess creature, giant, phoenix or lavamancer which can be handy in different cenarios. Also helps a bit against decks that maindeck Chalice of the Void so you still make a token by casting non-creature spells even if chalice is countering it
Phoenix of Ash and Grim Lavamancer are basically reccuring sources of damage and mana sink.
If running Soul-Scar Mage then the flex slot could be Seal of Fire too
Sideboard:
Everlasting Torment wither can be useful in some matches, preventing life gain can bring the game to an end sooner, the last part could be used against pro red cards and can also be used as an alternative against Nine Lives lock.
Lantern of the Lost is quite useful as it removes a card when entering the battlefiled and can be poped later, since this is a non-delirium Obosh deck I like that this cardstill draws you a card even when getting rid off your opponents graveyard. The matches this would come in it should be more impactful to remove the opponent graveyard than loose your graveyard.
