I was saying Thalia due to First Strike.
Blocks Golems with ease.
If you can afford to pay the

to play this card and Thalia through 1 Lodestone Golem with no other sphere effects I guess you get him, but I think there's better options.
It's not anything close to a "huge difference". It's a very small difference. I confidently stand by my assertion that this card will see absolutely no play in competitive Vintage.
I'm with BC on this one. I think Insist is actually a better card. Adding a fair version of Flash and a Battlegrowth and adding the "can't be countered" to the initial spell is probably worse than just drawing a card in most cases.