Multiple Card Challenge

{Sustainer Cycle}

{Robed Wanderer}

{Conventical of Whispers}

{Nefarious Bishop}

{Homily of the Damned}

{viriss}

The enlarge mechanic: I’m unsure about it. I like the general idea of making creatures larger, but it creates some awkward interactions. The doubling effect is applied in layer 7C, meaning that the effects of +/- counters (7D) aren’t doubled. Also, I think that the ability is created when the enlarge counter is placed, meaning that anything happening after (ex. giant growth) isn’t doubled. Note also that while I’m not a layers expert by any means, this would be doubly confusing to any casual players.
I would like it a lot more if it said “base power and toughness”
Rage Bear: Pretty simple, but the impact when you have the space to connect versus when you don’t are quite different. An interesting alternative to a 4/2 or 3/3.
Jungle Boar: A very potent enlarge target. I’d say the base could be larger for a green beater, but the two-card 8/8 trampler combo is frightening enough. If you can’t enlarge it, though, it’s playable but subpar.
Embiggen: This actually has precedent in Soul’s Might, which is CMC 5. I’m unsure how that would scale to current Limited standards, but I think at least three is a good idea.
Aspect of Ocelot: This is behind the curve compared to other recent Auras like Frenzied Rage and Giant Spectacle- could easily be +2/+2, especially with being multicolored, or maybe another keyword and +1/+1.

{bagz}

The exorcise mechanic: A neat mechanic for black, but not quite for white. Exploit got away with it because the blue cards had blue effects after exploiting (exploitation). Having a locked effect of a P>T menace token makes the mechanic solidly non-white. I do like the flavor and how you cemented it with your cards.
Robed Wanderer: Costed correctly, and I like the idea, but see above for color issues.
Conventical of Whispers: A little weak compared to Khalni Graden, but Humans have more tribal synergies that plants so it’s almost certainly fine.
Nefarious Bishop: A solid lord. The ability is interesting, but I worry about how many sacrifice effects will exist in a set with . Unless the replacement also applies to sacrifices from exorcise? Next point, actually: the ability should be a replacement effect to actually work how you want it to (“IF a spell or ability would cause you to sacrifice another creature, you may instead exorcise.”).
Homily of the Damned: A little uncertain on the cost here. Four is probably fine, since the default two tokens (plus other effects) is okay for four and good at three, while the scaling number of tokens would be quite pushed at three. The grouphug + benefit effect (plus caring about life gained) definitely makes this white, though. Also making two types of Humans with different statlines is a bit awkward- maybe Clerics?

{Winner}
The winner is bagz!
Very close, thanks for the two good entries!