Beyond Merfolk tribal, the downside of Mistcaller is that it's just a 1/1, meaning it doesn't present a very fast clock and dies to Goblin Chainwhirler, which probably keeps it out of main decks in both Standard and Modern
A bit of extra value and disruption are not really worth the wait
This is especially powerful with creatures whose abilities damage themselves as a cost, which is how the Devoted Druid combo functions
For each Doctor, 500 alternate art special foil cards were printed, plus however many more to denote which Doctor
Reanimation decks are inherently weak to cards like [Deadly Cover-Up] that exile all copies of a card, so diversifying your reanimation targets isn't a bad thing.
Rakdos Oven Average Overall Price: $221 This red and black archetype has become extremely commonplace in standard in the wake of Ikoria: Lair of Behemoths