Spellcasting. The goblin wizard is a 5th-level spellcaster.  Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). It has the following wizard spells prepared:

Cantrips (at will): fire bolt*, mage hand, minor illusion, prestidigitation

1st level (4 slots): burning hands*, feather fall grease, mage armor, sleep 

2nd level (3 slots): dragon's breath, invisibility, mirror image, scorching ray*

3rd level (3 slots): counterspell, fireball*, phantom steed

4th level (2 slots): fabricate, fire shield*

*Evocation spell

Nimble Escape. The goblin can take the Disengage or Hide action as a bonus action on each of its turns.

Sculpt Spells. When Yoblin casts an evocation spell that forces other creatures he can see to make a saving throw, he can choose a number of them equal to 1 + the spell’s level. These creatures automatically succeed on their saving throws against the spell. If a successful save means a chosen creature would take half damage from the spell, it instead takes no damage from it.

Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) slashing damage.