This alone is a fairly decent answer to cards with toughness of two or less, while also getting around the targeted aspect so that it can damage warded creatures
When you cast a creature for its mutate cost, it's still considered being cast, and many are multicolored
The option to turn it into ink, a reasonable cost, and the 3/3 are just the cherries on top
Wizards of the Coast has also released information on a new Creature sub-type called "Aetherborn", and the first card to feature this is the Legendary Creature Gonti, Lord of Lurxury
Sunbird Standard is a little different, as it requires one or more as craft materials
Juri pairs especially well with fling effects since its cheap enough to replay a few times in a game