Farmer Maggot, Hobbit of the Marish (11U163) or Fredegar Bolger, Fatty (18R107) are popular choices
Imagine that in Commander with simple stuff like Mulldrifter or Eternal Witness or even something bigger like Grave Titan or Sun Titan
Their opponent was at a high life total and was winning the race, but the stacked-up emblems meant that all their work was in vain
Many of these cards especially the best colorless creatures MTG like Wurmcoil Engine also have a triggered ability that goes off when they enter the field or when a certain event happens, which can add layers of strategy to your turns
Obviously, being physical cards, you can trade and sell these to your hearts content to fund upgrades if so desired
Still, these options offer plenty of potential for exciting mechanical effects, and there's one new addition in particular that I can see being very popular in both Standard and Commander