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Blood Tithe and Remorseless Punishment seem low-impact in Commander: everyone starts with a lot of life so hitting everyone for 3 or one player for 10 in a non-repeatable way doesn't accomplish that much

Nasty End has competition with Village Rites and Deadly Dispute, but its an easy draw-3 with commanders that want to die

Similarly, Llanowar ElvesLlanowar Elves would have a mana sequence of 0,1, while Dark RitualDark Ritual would have 3,0, and Smothering TitheSmothering Tithe could have a Gold/Treasure sequence of 0,1, assuming one player consistently doesnt pay the tax

Doing research into the different battle style mechanics will help improve your gameplay