...almost fair, I think.
"One-turn combos" are always more powerful than "Two-turn combos". Eg. Dune Scorpion + Blessing/Momentum/Chaos Power can be played in the same turn and the works is done before the opponent could react anything. On the other hand, for a Firefly Queen combo you need to play the Queen first and it can start spamming the Fireflies in the next turn, so, there is a chance to counter the process.
Shard of Focus is "semi-one-turn" due to the high HP. In theory, the opponent can react, in practice, very few things work (Lobotomizer and Liquid Shadow are my best bets, though, Guard/Congeal/Rewind/etc. can hinder the Shard). Plus, it is versatile indeed, especially with 45 HPs...
On the other hand, it can be used limited times.
1 HP is a bit few, I suppose. About 6HP would be fair. Eludes Rage, Lightning and Shockwave for good but, with some quanta in reserve, Siphon/Fire/Ice Bolt kills it, an Otyugh eats it after its 2nd meal. Perhaps it could gain only 5HP per destroy and could turn into a Black Hole at 21HP - no more Gravity Pull megatank, Acceleration time bomb, etc.