Trying to get the sideboard tweaked
By Force is brought in for Affinity, Lantern, and ETron (for Chalice)
Ceremonious Rejection is good for any kind of Tron
Collective Brutality is a bit of extra removal against aggro, plus extra discard against combo
Kolaghan's Command for the mirror and other grindy matchups. Pulls double duty against Affinity
Kozilek's Return is another one against aggro, Company decks, and especially Affinity, since it gets around Etched Champion. Possibly also good against Storm when they're on the Empty the Warrens plan
Liliana of the Veil for the mirror, various midrange, ETron, possibly Titanshift and D&T. Still learning this card, so not as sure here
Liliana, the Last Hope is another card for the grind. Should be good in the mirror and midrange matchups for buying back creatures. Repeatable removal against some of the lower to the ground strategies like Humans, D&T, and Company. Possibly good against Affinity since she'll eat a lot of the smaller dudes, but possibly too slow here compared to Return, By Force, or any spot removal
Ratchet Bomb is doing a poor man's impression of Engineered Explosives. Gives me a way to deal with more problematic permanents, since Grixis is limited on options in some cases there. Also good against tokens
Stubborn Denial extra counters against control decks, Burn, Storm and other combo
Temur Battle Rage for when you need to win fast, or when the board is likely to be clogged with little dudes. Should be good against ETron, Storm, Humans, D&T, and any kind of weenie strategy. Possibly useful for racing Burn or Zoo
Young Pyromancer another card for the long game. Should be useful in the mirror, against any kind of midrange strategy, and against graveyard hate. Allows us to clog the board if needed, and can present a threat when Shadow may be difficult and delve is unreliable. Can also overload removal against decks relying on spot removal
