This includes your commander and all cards listed in the life drain/death triggers section
We rock Tithe (which can get Plains or Mistveil Plains) and stuff like Solemn Simulacrum, Burnished Hart, Armillary Sphere, Palladium Myr, Pilgrims Eye, and more
Having an effect like Anointed Procession in the command zone is brilliant, as if its remove you can get it back in a turn or two and continue with your game plan
This discounting mechanic scales rapidly, allowing big-impact plays much earlier than opponents expect, and it pairs well with self-mill strategies that keep the graveyard stocked
Heros Path was part of the Theros block promotional events
Orzhov control decks revel in this fact, controlling the flow of a game by prohibiting your opponents from controlling their key permanents and win conditions through a blend of targeted removal and board wipes