Target player mills a card
If you were in the same scenario but Pit Scorpion was attacking rather than the elf, youd die to combat damage before the trigger to add a poison counter went on the stack
Pantlaza, Sun-Favored, Runic Armasaur, Curious Altisaur, Ripjaw Raptor, Earthshaker Dreadmaw, Etali, Primal Storm, Regal Behemoth, Return of the Wildspeaker, Rishkar's Expertise, Lifecrafter's Bestiary, Descendants' Path 11 card draw
There's also hate for counters (Vampire Hexmage), Storm/Spellslinging (Flusterstorm & Arcane Laboratory), lifegain (Archfiend of Dispair)), as well as a few extra board wipes and removal in case they play tokens or something with lots of creatures
Repeat this process until all cards exiled this way have been chosen
Sacrifice it at the end of combat