In general, you can add any legal card in a given Magic: The Gathering format
It can come from anywhere - your hand, the battlefield, your library, or even from exile if you can figure out a way to do that
However, any time you sacrifice a nontoken Elemental you get a hasty copy of it
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
Professional Face-BreakerProfessional Face-Breaker is a card that players are all too familiar with
The card was unparalleled in its ability to 'tutor' and play exactly what a player needed, particularly in a Standard environment full of Artifact decks with many cheap Artifacts to sacrifice