I use this term loosely but am mostly looking for card draw or any spell that nets me 2+ non-land cards in hand / directly into play 10 sources of "card advantage;" split between creature / artifact / enchantment removal 6 targeted removal, creature-light decks might want one more, creature-heavy decks might want one less 3 board wipes
Plenty of Magic strategies want instant and sorcery cards in your graveyard like collect evidence, spell mastery, and lessons, to those we toast Wisdom of Ages
Attach up to 2 Basic Energy cards from your discard pile to 1 of your Stage 2 Pokmon
If you don't hear back after a week, it's safe to move to the next artist
There is something to be said for Necropotence, but be aware that it is another of those cards which will put a target on you quickly
What comes in a deck of Japanese One Piece cards