Recurs the
Endless Nightmares (with killer if possible) by holding up power at the end of turn, which synergizes well with ambush and fast spells.
Xumucan, the Surveyor is amazing as always.
Gentle Grazer has mostly useful hits off the summon, but
Seek Power is usually a bad one unfortunately. I only had two copies of
Gentle Grazer or I might try more, but it's been decent at least.
Update:
Swapped seek powers for Waystones to get better results from
Gentle Grazer
Update 2:
LightsOutAce suggested a couple swaps, so I'm testing them.
Another awesome hit off of Gentle Grazer when you play him and immediately can give one of your units deadly before declaring your block.