For what it's worth, I think Punishing Fire is where Maverick may want to be right now. I played a pair of Czech Piles at EE7 and never lost a round (2-0 and 2-1). The exact list, including the board, is here:
https://deckbox.org/sets/1802850 and my boarding strategy was as follows:
Out: -2 Noble Hierarch, -2 Stoneforge Mystic, -1 Sword of Fire and Ice, -1 Umezawa's Jitte, -1 Swords to Plowshares, -1 Qasali Pridemage
In: +2 Pyroblast, +2 Red Elemental Blast, +1 Sylvan Library, +1 Ramunap Exacator, +1 Elspeth, Knight Errant, +1 Fiery Justice
Adding Punishing Fire is huge game against Czech Pile because you are dramatically more mana-efficient with an effect every turn, plus the added percentage points against Hymn to Tourach. Additionally, it invalidates nearly all of their creatures save Leovold, Gurmag Angler, and True-Name Nemesis, of which Swords to Plowshares hammers through two of the three anyway. Punishing Fire also pressures their planeswalkers and hurts Liliana of the Veil.
While the game is going to be grindy, you will probably be out-ground if you take the back seat. Deathrite Shaman is public enemy number one in these matchups since it hurts both Knight of the Reliquary and Ramunap Excavator, of which the former is formidable enough to just attack right into Gurmags and True-Names all day. In fact, Knight often gets so large, that a resolved True-Name Nemesis is just not a problem since it can never attack for fear of death by 10/10 Magus of the Crop Rotation. A second Knight or a few other attackers is all it takes for lights out. My reasoning with siding out Noble Hierarch is that I won't be playing around soft permission like Daze so I want my average card quality to be higher. While I have never tested the matchup against Sneak and Show and am unsure if I can cut the 4th blast effect for something more relevant, I know that I really want either Arlinn Kord or Chandra, Pyromaster for this matchup in particular. Even so, it's felt roughly even.