How do I get Natasha & Clint & Blastaar?

[texaswashingto]

I'm assuming Natasha and Blastaar LE's are con awards, but what about Clint?

[TheAuthority]

Yup...he's an LE too.

[Doctor Strange]

Clint can be won at standard tournys, but Blaastar and Nina are only going to be at conventions to my knowledge :(