Also that Blessing can be used over Chaos Power in limited-ups events to avoid using up some of your upgrades on your buff cards.
Blessing tends to work better than Chaos Power with, say, Otyughs, because the reliability of gaining 3 HP is actually pretty important.
Serious competitive decks I can think of that use Blessing or CP (not guaranteeing I'll remember them all but here's trying)
-Pegasus (uses blessing because light is in element)
-Wyrm (Chaos is more common, blessing also used. Upside greater than downside for CP)
-Dunes (Either or, depends on support cards. Blessing if used is chosen for being in element with Sancs for stalling)
-Ball Lightning - Chaos Power is more common due to low cost.
-Chargers - Chaos Power more common due to being splashable
-Otys - Blessing more common due to reliability of HP increase, also in element with sanc
-Deja Vu - Blessing more common for controlled adrena hotspots in bow, also more common for reliability in a duo setting.
On the whole it actually looks kinda balanced unless I'm missing something.
Scibra or someone can explain how the card cost theory works, but it's something to do with
getting a -1 bonus to cost for all cards with random effects.