Also I think Siren base may need a buff moveset-wise, base has strictly worse moveset than fencer if we dont take into account compel, which does not seem to be that usefull (maybe against enthropic minions it clears the path for an attack, but still), I have not used Siren a lot tho so take this with a grain of salt).
I understand it can't be cheaper since then it would eliminate the whole poing of base Greed.
Maybe making compel stack would be an interesting buff (?)
Techincally speaking base is almost fine, compared to skeleton+ and royalguard+ and probably some other piece the siren ability is worth 1 point more i guess. The common thing among all these pieces though is that merc almost always outclasses them. royalguard+ gets outclassed by other tiers of royal guard. In conclusion buff sirens ability somehow
Compared to those it is decent but now Fencer base cost the same, has more diagonal movement and armor.
I did not compare it to minions because they do not compete for the campion slot, it is bad when compared to Fencer moveset, maybe on its own is not a bad 4 cost champion but I can't think of a deck that would prefer Siren over Fencer (maybe compel is better than I think and I am mistaken, but from my experience compel is not worth more than 2 more diagonal movement and armor)