Stinkweed Imp

{2}{B}Creature — Imp1/2

Flying

Whenever this creature deals combat damage to a creature, destroy that creature.

Dredge 5 (If you would draw a card, you may mill five cards instead. If you do, return this card from your graveyard to your hand.)

Flying. This creature can't be blocked except by creatures with flying or reach. · CR 702.9

Notably, Stinkweed Imp's ability isn't deathtouch. It's a triggered ability that triggers only on combat damage. (2021-03-19)
Once you've announced that you're applying a card's dredge ability to replace a draw, players can't take any actions until you've put that card into your hand and milled cards. (2024-01-12)
If you're drawing multiple cards, each draw is performed one at a time. For example, if you're instructed to draw two cards and you replace the first draw with a dredge ability, another card with a dredge ability (including one that was milled by the first dredge ability) may be used to replace the second draw. (2024-01-12)
One card draw can't be replaced by multiple dredge abilities. (2024-01-12)
You can't attempt to use a dredge ability if you don't have enough cards in your library. (2024-01-12)
Dredge can replace any card draw, not only the one during your draw step. (2024-01-12)
If an effect puts a card into your hand without specifically using the word "draw," you're not drawing a card. Dredge can't replace this event. (2024-01-12)