For the first few years of its production, Magic: The Gathering featured a small number of cards with names or artwork with demonic or occultist themes, in 1995 the company elected to remove such references from the game
The goal is to exploit something smaller and keep the 4/6 deathtoucher intact, but sacrificing Sidisi to itself and grabbing a mass reanimation effect is always a solid gameplan, too
Corrupted For each opponent who has three or more poison counters as you cast this spell, put up to one target creature card from that player's graveyard onto the battlefield under your control
What happens next depends on the type of spell you are casting, but typically, it will usually have a one-time effect and then go to the graveyard, or it will become a permanent that stays on the battlefield until it is removed
Magda is excellent alongside other dwarves, and it also works just fine as a solo attacker
Triggered abilities (starting with "when," "whenever," or "at") are unaffected by Karn