Muthead

Back to Dumping those +2 SPD Strat Cards seemed like such a waste... but worth it in the end.

Single thread,
RickRude

Do they need to be the rare strategy cards?

thcgamer

Rare give you more boosts, also the only one with + speed. As long as you upgrade a common card all the way think it's good. If you don't have the rare version.