At that point, you will just be praying the top of your deck has useful spells to keep you in the game
That -6 ability will be partially good as green tends to suffer a bit from reliable sources to draw cards
When you copy a spell on the stack, the rules say the copy copies the characteristics of the spell or ability and all decisions made for it, including additional or alternative costs. That means that, if you cast Mulldrifter for its evoke cost and then you copy the spell with Double Major, the copy is treated as if its evoke cost was paid as well
World at War World at War is a solid additional combat sorcery
The downside is that it can be really hard to gain any advantage if you cant get damage onto their characters without making bad trades (losing a powerful character of yours for a cheap one of theirs) or without completely banishing them
Johann, Apprentice Sorcerer Excuse the oxymoron, but its rare to see these at uncommon