Your opponent's desire to keep their creatures alive, and not have them killed almost immediately after they enter the battlefield, means that enemies are just as likely to not attack as they are to not block
There are a lot of cards in Animated Army that this works great with, like Thickest in the Thicket, which can target itself with its own enters ability
Incapsula incident ID: 679000180012549307-37701918753490065
Obviously, you cannot tell by looking at them from the outside, as their content is supposed to be a surprise for the collector who opens the pack
Kumena turns Merfolk into a Tap/Untap deck: we tap down our army to draw cards and buff them with counters, then utilize mass untappers like Intruder Alarm to do it again and again
In effect, what you get is the ability to sprinkle your deck with Equipment without diminishing your creature count