I can't see Summoner Specialist ever being used.

Summoner Specialist:

You start with 1 Summoner Shard and gain an additional Summoner Shard each time you cast a Summoner Spell. Swap a Summoner Spell to a different one by exchanging 3 Summoner Shards at the shop. Additionally, gain 15% Summoner Spell cooldown reduction. (You cannot have two of the same Summoner Spells)

As cool as the idea is, realistically i cant ever see it being used.

already dominates this game and every role will always take it no matter what.

used mostly on mid lane and assassins almost always taken top is a must for the ADC role is a must for most supports is a must for junglers.

are situational is a joke.

The problem is the meta determins what roles get what sommoner spells and the lack of summoner spells to begin with makes swapping mid match even less appealing.

I think if the shards instead UPGRADED summoner spells in a way instead of swapping them then it would become a top pick. But just swapping out a summoner spell for another is really not all that useful in my opinion.