I love playing this commander and I do have a few suggestions.
Cut the
Citywide Bust. If you have creatures that you want to use with a higher health (ex.
Pontiff of Blight) you would rather keep them on the board.
Cut the
Ankle Shanker. Unfortunately, attack triggers do not trigger from Alesha's reanimation, as they were not officially declared as an attacker.
Cut the
Wear/
Tear. As nice as the cheap removal is, you already have a lot more removal that is a lot more flexible and also at instant speed.
Cut the
Crackling Doom. If you have been able to play this and it works out well then keep it, but I never found an occasion where it actually mattered at all.
Add
Smothering Tithe. As you may notice, your only mana ramp is limited to rocks, which could be problematic.
Add
Crypt Incursion. This card is great against other reanimator decks and gives you a lot of life, which can also save you in a clutch moment.
Add
Fulminator Mage. Bit of a more expensive card, but follows the same type of play as
Avalanche Riders and can be pretty annoying for your opponents.
Add
Austere Command. It is a more consistent board wipe for your deck and allows you to keep your creatures with a larger toughness.