Priestess of Sanzu

Normally you can only attack tapped entities. Priestess can also hit untapped ones, but only while they are Rooted, and Rooted ends at the start of your next turn. So she has to be in your Garden already when you Root: play her a turn early, then Root and attack in the same turn.

Stillness is the best pairing. It Roots everything with base health 2 or less, and her 2 attack destroys most of them; Kale’s Carapace 1 or a health buff keeps one alive. Entangled Fate, Lord of the Woods, Kasumigami and Sandcoil Python can Root bigger entities, but 2 damage rarely finishes those.

She has 2 health, so any target with 2 or more attack destroys her too. Without a Rooted target she can only attack tapped entities and can never hit the leader. Gate Power 2 makes her a fair Alley body for your Gate until the Root turn.

Wind Drawn Archer has the same untapped-Rooted attack and can also hit leaders. Blissful Ambusher can take Charge the turn it lands, but then it can only attack Rooted entities, tapped or untapped.