Disorient: Causes enemies within a wide area to abandon their current orders and move to random nearby locations.
Mana Leak: Temporarily curses a single target which causes 20% of their maximum mana to drain whenever they use a spell.
Enfeebling Backfire: Temporarily curses a single target to have its attack and movement speed reduced whenever it physically attacks. If the unit is already under the slowing effect, its debuff is intensified (using a higher level dummy slow spell).
Deception: Causes all nearby allies in a small radius to become invisible for a very short time. Units under this effect also gain a 10% damage bonus until after their first attack (inspired by Windwalk's backstab damage) or the invisibility buff runs out.
Greed Bomb: Plants an item on the ground which explodes upon pickup dealing damage to all nearby units. The fake item should have an invisible indicator (using Abilities\Spells\Other\TalkToMe\TalkToMe) to warn allies of it. The bomb can blow the indicator as well, so you don't have to track it as a variable of any kind.