Rikku, Resourceful Guardian allows you to force a creature through your opponents' blockers, as well as steal counters, and Lulu, Stern Guardian protects you by putting stun counters on your opponents creatures, as well as proliferating to keep them around
Would you want a fluffle of these creatures surrounding you
Magic is the same way
The four-drop 2/4 blocker has an EOT trigger for you to have everyone draw a card, and if a foe does, they cannot swing your way to keep you safe a round
We know how dominant Pod is in casual, Highlander and Commander where you can tutor up the best thing for the situation
Pair it with other foretell spells like Doomskar to keep your opponents guessing, or hold it up in an aggressive deck where protecting your creatures is key