If the summoner can be a playable unit, how would you design it?

I got extremely bored so I made this one fully with FEH builder. The stats in the image reflect values after skills and summoner support (or more accurately, partnered ally support). Yeah it is meant to be OP so bite me.

Kiran - Great Summoner
HP 39, Atk 35, Spd 35, Def 28, Res 28, Total 165, Rg 2

Breiðablik: Grants HP+5. Neutralizes weapon-triangle advantage granted by unit's skills. If unit has weapon-triangle disadvantage, reverses weapon-triangle advantage granted by foe's skills. If unit is within 2 spaces of a summoner supported ally, grants Atk/Spd/Def/Res+4 during combat.

Skill Link: Grants a full charge special to target ally. Grants unit Special cooldown charge +1.

Infinity Pulse: Boosts damage by total bonuses and penalties on unit + total bonuses and penalties on foe.

Grand Challenge: Grants Atk/Spd/Def/Res+4. If unit is 5★ and level 40 and unit's stats total less than 170 and unit enters battle with at least two allies that are 5★+10 and level 40, treats unit as 5★+10 and unit's stats as 170 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.)

Destiny Bond: If unit is within 2 spaces of a summoner supported ally, unit makes a guaranteed follow-up attack. Grants Atk/Spd/Def/Res+4 to summoner supported ally within 2 spaces during combat. If a summoner supported ally's HP ≤ 50%, unit can move to a space adjacent to that ally.

Blitzkrieg: At start of turn, if unit is adjacent to an ally, unit and all adjacent allies can move a number of spaces equal to the highest amount among the unit and adjacent allies can move. (Movement terrain restriction applies.)

===NOTES===
Summoner Support bonus stats are granted to the unit in the same way as the summoner supported unit. The stat bonuses apply even if the supported unit is not active on the field, just like how the supported unit gets the stat bonus even without the summoner active on the field.

Breiðablik has 15 might and the base weapon skill of Cancel Affinity 3. It can be refined for the in-combat stat boost. Costs 400 SP for the base skill and 500 SP + 300 Divine Dew to refine.

Skill Link fully charges the target's special, regardless of current cooldown charge. Each time the unit uses this assist skill, the unit gets +1 charge to its special. Will not have further effects if unit has its special charged. Costs 400 SP.

Infinity Pulse has the effect of skills like Glimmer but adds both bonuses and penalties on the unit and the foe it is battling. Infinity Pulse will deal no damage if both the unit and foe do not have any bonuses or penalties. Costs 500 SP.

Grand Challenge grants the stat bonus regardless of whether the conditions stated after are met or not. The conditions are set to effectively treat the unit as if it has been merged at +10 as a 5★ unit with 170 BST instead of its native 165 since this unit can only have one copy and cannot be merged. Costs 350 SP.

Destiny Bond allows the unit to double in both phases regardless of Spd if the summoner supported ally is within 2 spaces. Consequently, if the summoner supported ally is not active on the field, the unit does not receieve this mechanic but can still make follow-up attacks if it passes the Spd check. Its Wings of Mercy 3 effect only applies to the summoner supported ally and cannot move to any other unit in this way. Costs 300 SP.

Blitzkrieg allows all allies adjacent to the unit to move a number of spaces equal to the highest number among them. If unit is next to an armored unit, the armored unit can move 2 spaces because the unit can move 2 spaces. If unit is next to both an armored unit and a cavalry unit, all three of them can move 3 spaces. Terrain restrictions can still apply so cavalry cannot traverse forests and non-fliers cannot traverse mountains. Infantry can move into forests but cannot move further once they enter a forest tile. In effect, infantry can move two spaces on regular terrain and then enter a forest tile if at least one cavalry unit was next to the unit at the start of the turn. Costs 300 SP.