The other thing you might consider fabricate to tutor for your combo piece. If you don't mind splashing black, perplex would be an idea as well. This should be easy in extended, and more fetches thin your deck more.
I think thirst for knowledge would be good in there, too.
Simic sky swallower seems really slow, and early game null draws are bad. so I would take him out for tarmogoyf.
other than that, ancestral visions and such are very good. Expedition map or sylvan scrying for magosi, etc.
The other thing you might consider fabricate to tutor for your combo piece. If you don't mind splashing black, perplex would be an idea as well. This should be easy in extended, and more fetches thin your deck more.
I think thirst for knowledge would be good in there, too.
Simic sky swallower seems really slow, and early game null draws are bad. so I would take him out for tarmogoyf.
other than that, ancestral visions and such are very good. Expedition map or sylvan scrying for magosi, etc.