without actually keeping track, the easiest is decay
permanent destruction is so
but bonewall tricks are really really proving strong. havent seen any evidence that regular boneyard is costing me anything
rainbow is impossible. stealing my dials with no PC is death. at best i can survive till hes at 40 cards left or so. knowing that winning any cards from rainbow is so rare and long to accomplish...id say this is a skip
morte hasnt been
that bad, certainly not as bad as scorpio
seism is an even fight. much easier than obliterator, as seism cant actually use the pulvy. fair share of losses of course, but some wins happen
decay is a win 9/10. lost once recently to early eclipse + drainlife spam + odd quantum distribution, very uncommon. jade shield = autowin. he steals my hourglasses and shards, but it only takes a 2 card combo to win. rainbows do ok against decay, imo
id say scorpio + dark matter are worst. rainbow doesnt count, i refuse to stack steals just to make him an option (im afraid deck is already too big)
-edit- eternal phoenix is such a jerk. theoretically i can pull off a win...but it never ever happens