Loyalty abilities of planeswalkers are also specifically excluded from counting as mana abilities
If a land you control is simply put onto the battlefield tapped without a replacement effect being applied, it always enters untapped if you control Spelunking
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So in a Commander context, I see discard as the best way to describe a swathe of interdependent synergistic mechanics, mostly based in black, which look for advantage by quickly pitching their own hand to the graveyard
Hypnotic Specter Look, making an opponent discard a card at random is strong
Before then, commanders (at the time called generals) all had protection from Karakas