Some of these were already mentioned, but I just post here my collection intact. I know these do not all connect directly to the target choosing algorithm, but may be of help nevertheless.
- using Sundials/Hourglasses, and decking out
- Rewinding/using Eternity and preventing me decking out before him
- it uses Healing with Emerald Shield on
- stealing Bone shield/wall (to replace perfectly functioning Phase shield, Dissipation Field, etc.)
- plays small HP creatures (and FFQ creates Fireflies), even if I have multiple Otyughs
- poisons ALWAYS one creature (with most damage), insted small but dangerous ones (like Werewolf)
- targets the creature with largest damage, instead of the one, who generates hundreds of minions and much larger damage therefore (Fireflies instead of FFQ, Skeletons instead of Otyugh & Boneyard)
- uses Protect/Enchant artefact on Sundial right before it expires and disappears
- Sundial is active, but he keeps spending quantums on Dive
- Plays Spark, when Sundial is active, AND I've got Bone shield
- Freezes Firefly instead of Firefly Queen