the emotions can in some cases be duo cards, linked with appropriate elements, 
= rage for example. in your spectre example could lower the initial cost of the card, make it an active ability to click and add atk, the atk added could be based off of the current hp %. but your spectre is also fine as is mechanically it is interesting, just using it as an example at the moment.
and one idea for including sacrifice mechanics, maybe reduce your hp by 10% and have a target creature gain ~5-10 atk
I like this idea, in the emotional aspects of manipulation by mind, it could thematically fit and be potential for synergies.
some of my ideas include:
Beserk: (could use
if creature skill) Everytime creature attacks, It gains +2/-2. 50% chance it attacks its owner.
Its similar to Rage +acceleration in the case of either benefiting yourself or CC, but with a small dominance in CC rather than self benefit. you could still take the risk however. if you dare
Fear: (could use a
activation if its a creature skill)
40% chance creature doesn't attack and gains +0/-2.
Joy: (If creature based, could use
), Target creature's skill is replaced with growth. Cost of growth is equal to half the creature's cost (rounded up).
note: growth still uses
, just the amount needed is changed.
