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twice for $150,000 in October 2020, and again for $175,000 in summer 2023

Slagstorm deals 3 damage to each creature on the battlefield for only three mana (or it can deal the last 3 damage to your opponent in a pinch)

That definitely ensures the smallest possibility of any damage occurring upon removal, so makes sense

This can stop your opponent from doing many things, including recovering HP by Evolving their Active Pokemon, getting Abilities they need on the field, or Evolving to bypass Status Effects

As aristocrats decks aim to gain value from sacrificing creatures, often including a litany of cards with death-based triggers, Teysa can double the effectiveness of each of these triggered abilities, providing absurd amounts of value from what are normally somewhat unimpressive actions

Your friend is correct, he can prevent Wither and/or Infect damage just like regular damage