See the person next to you? Kill! Kill!!! KILLL!!!!
I'm your baby! Can you feel it?
No, when a card says to "gain" a card like a terror card it means to your discard pile, but action cards that give +1 or more cards mean to draw from your deck.
Edit: just realized ingot distracted by Pedro's last post because it's so totally wrong (at least to me "gain to deck" isn't the same as gaining to the discard), the second poster already had it right.
Just to clarify, when I say "deck" this means hand + discard pile + draw deck. So to gain a card usually makes your deck bigger (regardless of where the card is "gained to").
Thanks for clarifying.