Josu Vess, Lich Knight [Best Late-Game Finisher With Single-Cast Impact] Josu Vess, Lich Knight is a straightforward but dangerous commander whose kicker turns a single cast into a massive Zombie army
His -1 cost reduction might help get you there, but definitely needs to combo with other cost-reducers
However, this feels quite basic, and while no pre-con is going to be massively overpowered out of the box without a few upgrades, it just feels like this deck needs something more to aid its versatility
If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack