This often takes the form of removal, like Thraben Charm and Will of the Mardu, though some cards buff creatures based on how many you control, like Heidegger, Shinra Executive and Team Avatar
They all offer a reasonable buff, powerful protection, and great combat damage triggers
After the cards ride up, there is some empty space in the bottom corners, which leads to corner bending
However, if you want to complete the set, it can be a bit of a trek
When the last is removed, sacrifice it.) When Crack in Time enters the battlefield and at the beginning of your precombat main phase, exile target creature an opponent controls until Crack in Time leaves the battlefield
Mardu also makes a great color identity for a number of creature types