Sure, you can easily whiff and hit lands or spells that aren't useful (Counterspell, Comet Storm, etc.) but generally speaking this ability is going to be well worth using
If you want more written content, make sure to check out our Lorwyn Eclipsed deck techs and be on the lookout for my fun ranking coming soon
What the best Sephiroth deck is remains unclear
It is a huge mana sink, but with infinite mana or a large amount of it, you mostly guarantee a loss of life enough to kill the table after they run out of permanents
Your removal and draw suites let you outlast both, with Terror in particular lacking a deep enough threat pool to really oppose you
It can take a while to get to 1000 time counters for each opponent to lose 1000 life, but if theres no artifact removal, it can be an eventual win condition