Magik vs. Bastion

Magik...perhaps.

In Limbo: Magik wins.
 
Out of Limbo: It's possible that Bastion himself also has the "weaponized spell" the Purifiers used. If he doesn't, I'd still put my money on Bastion.

#1: Magik.
#2: Batison.

Magik wins in Limbo.

One earth it's closer but Magik should still win. Bastion can adapt but Magik can manipulate energy and she turned a fleet of Advanced Blockbuster Sentinels who can adapt to attacks similar to Bastion, into slag with a spell. She can multi-task with different spells at the same time. She can transmute stuff and has other powers as well.

Gallery

Scans aren't in order:

middle scan-Blockbuster Sentinel has adaptive Technology.

3rd scan-Magik surrounds her team w/ a magical barrier then conjures up a magical construct

1st scan- she manipulates energy and makes the Sentinels attack each other then she blows up their energy source inside them, the magical Hydra also absorbs and turns their armor in slag.

If this is Magik as Darkchilde (fully powered and blood lusted) who stomps on top Hell Lords, she obliterates Bastion w/o much trouble.