Sorry about that, I will elaborate on these. Once I mention the commanders for some of these, the role they play will become self explanatory I think. Sorry about the big list of cards, trying not to clutter the thread with 15 single posts.
Disciple of Griselbrand in
Karador, Ghost Chieftain as one of my "fair" sac outlets to avoid infinite combos. Cost to activate prevents infinites and the life gain helps offset the life for cards that black likes to pay for its draw. While the activation cost is annoying, it's a price I pay willingly over options like
Viscera Seer to curb power level. Turns every land into a
Diamond Valley, so seems like a good rate.
Victory Chimes in
Talrand, Sky Summoner no creature, draw-go, drake beatdown. This can create
or
a turn cycle depending on what I'm casting. basically a free mana on my turn that will untap for interaction afterwards. Good for commanders with activation costs.
Kalamax, the Stormsire cards: Could probably pull these off EDHrec, but some real world feedback never hurt.
Electric Revelation draws 4 cards on each casting when copied, but I only have to discard one when cast, not on the copy also. Just helps keeps cards flowing when I can dig 8 cards deep over a couple turns for only 1 card slot. Becoming one of my favorite draw spells due to efficiency and card volume.
Wavebreak Hippocamp incentivizes casting spells on opponent's turns. Nets some incremental advantage for little mana.
Cultivator's Caravan ramps and allows Kalamax to tap outside of combat. Very important should be board get cluttered.
Sefris of the Hidden Ways cards
Bonded Fetch Since Sefris only triggers once each turn, instant speed ways to put creatures in the graveyard are good value. This is the only haste looter I could find.
Spellkeeper Weird self-sacrifice creatures are great ways to trigger Sefris on opponent's turns. This buys back a removal spell and triggers my commander. Evoke is good too, but those aren't niche or hidden.
Sphinx of Lost Truths Good one shot looter with reasonable body that can kick later for big draw. Mainly here for the looting. Sort of a pet card for me. I think graveyard decks in blue are sleeping on this card.