Tldr: I think Sihil is way too conditional and would only work out of certain control decks. (E.g NG spies, siege? With good setup, bounty?)
Reasons:
1. 12 provisions incredibly expensive
You want to play the sihil as early as possible and across every round to gain the most value of it (making the absolute ceiling a 16), but more likely than not, it ends up playing for maybe 8-9? (Best case) and 4-5 (worst case)
That means you need the 1 point setup asap, which either means 1 point enemy units (aka spies), leader usage (reckless flurry, guerilla tactics etc) or several rounds of control to setup that 1 point play
And the ceiling of each sihil play outside of the damage and 1 point increment is playing a bronze unit FROM HAND and putting sihil back in hand , no card advantage, no tutoring, which makes it only slightly stronger than playing a bronze by itself, which as we all know is not as good as playing many gold cards (excluding certain archetypes e.g siege).
Because in a sense, you would need to setup your hand in a way that you have sihil + many bronze cards to glean maximum value from it which brings about its own consistency issues (mulliganing the right hand, winning or bleeding r1 well etc)
We'll have to see how the meta panes out, but I don't have high hopes for this card.
Maybe a revision of the card could be:
Damage a unit by 1.
Deathblow: Play a bronze unit from your deck and place Sihil on the top of your deck.
Initiative: Increase the damage of Sihil by 2 for the rest of the game.
This would preserve card advantage, provide tutoring 1 and encourage draw manipulation metas like WP. But I'm not a designer
Source: https://www.reddit.com/r/gwent/comments/un1yrr/sihil_overrated/