Theyre known for being white creatures with flying, usually with high power and toughness, often packing threatening combat keywords to boot
Mana Crypt costs zero to cast and immediately generates two mana which recurs every turn, though it has a chance of dealing three damage to you on your upkeep, a downside far outweighed by the absolutely ludicrous upside
If you played without any ones or twos, you could guarantee your cascades always hit a Hypergenesis, which, despite having no cost, counts as zero cost for cascade
What players need to know about Dimir is that they have some expensive casting cost cards due to the cipher mechanic and because many of the staple tools have mill or library destruction baked in
By design, infect counters are nearly impossible to remove, but Leeches are the way to do it