Needs ramp, preferably creature-based, non-etb effects
Go wide with creatures, preferably creature-based
Card draw, preferably creature-based
Lands too slow?
Manifest effects: 3

Manifest is a costly experience. Typically you pay for the creatures to manifest and then if you want to benefit from global effects they possess, (I do) you need to pay to flip them. It is also beneficial to ensure you manifest the correct cards. There is too much of an investment and need for support with too few actually good cards for manifest. Subtheme at best.

REMOVED:
Aegis of the Gods - too small
Ediololololon of Rhetoric - too small, too much attention
Anafenza - too small, anthem would be better
Spirit of the Labyrinth - too small
Stoic Angel - doesn't fit with theme
Roon - not enough ETB effects
Cathar's Crusade - not enough ETB, kind of annoying
Temur Sabretooth - same as Roon
Dawntreader Elk - better spell ramp
Sakura-tribe elder - better spell ramp
Willbreaker - Dismiss into dream more permanent removal