Rayl turns

acc = accuracy roll required
auto = automatic damage

Average damage turn (at least one turn of setup required):
Withering Necrospire (Rayl's slow, if he devotes all actions to damage): 2d6+2 (acc)
Mordred attack (free): 1d8+2 (acc)
Suspicious Shrub (free): 1d8 (acc)
Final: 2d6+2d8+4 (acc)
Average damage: (20 x .75) = 15

More likely average turn:
Summon, non-damage command, or heal (Rayl's quick)
Maybe a cantrip attack (Rayl's quick): ~1d6 (acc)
Mordred attack (free): 1d8+2 (acc)
Suspicious Shrub (free): 1d8 (acc)
Final: 1d6+2d8+2 (acc)
Average damage: (14.5 x .75) ~= 11

Optimal turn (multiple turns of setup required):
Burning Field (Rayl's slow): 1d6 (acc), 6 (auto, enemy's following turn)
Fire imbued Mordred (free): 1d8+4 (acc), 1d6+2 (auto)
Mordred threaten attack (free): 1d8+4 (acc, enemy's following turn)
Rosebriar (free): 1d8+2 (acc)
Glitterbee (passive): 1d6 (auto, enemy's following turn)
Call the Swarm (passive): 5 (auto, enemy's following turn)
Call the Tree (passive): 1d6 (auto, enemy's following turn)
Vampiric Parasite: 4 (auto)
Final: (1d6+3d8+10 x .75) (acc) + 3d6+17 (auto)
Average damage: 47

Binds:
Arm: Impaired (aether, Wild Miracle), Impaired/Weakened (rare, crit with Withering Necrospire)
Leg: Knocked Down (Paleflower), Stuck (Creepyvine)
Mental: None

Other CC:
Paleflower reaction knockback once per round
Mordred threatens adjacent foes