Denry Klin, Editor in Chief Counter decks are often concerned with getting the counters on their creatures, which makes Denry Klin, Editor in Chief a handy tool for distribution
Its true that those zombies enter the battlefield tapped (its safer to cast it when you have enough blockers to protect you), but using one card to get from 13 to 26 2/2 black zombie creature tokens is terrifying
Sometimes you cant have both, but this card is flexible enough to go into a variety of decks
There's no room for messing about in an aggro deck by playing expensive draw spells or counterspells
The copies are created on the stack, so it's not "cast." Creating the copies won't cause abilities that trigger when a player casts a spell to trigger
It isnt much to go on, but if you see someone with, say, a large amount of Unglued Plains, Mountains, Swamps, and Islands for trade but no Forests, alarm bells should ring in your brain