Back in the day, hard card drawing plus hard counterspells equaled a lot of salty opponents
Unstoppable Plan gets the weenies (and all others) back online on your opponents' turns, freeing up for instant-convokes or just blockers
While having to ban cards in Standard is bad, hyping up a new card type and having it fall flat and go unplayed is (perhaps) just as bad, so Wizards is incentivized to take more risks to make sure new card types see play
Rydia is even a discard outlet for Yuna, Hope of Spira, so someone gets to live the dream of discarding Bahamut for Yuna to reanimate
I'm not proud of it), and the third helps to make sure that you hit your third land drop but also provides a bit of stall (in the freaky face-wall) and a bit of life in a cheap early enchantment
Fun fact: Lemurs are named after the lemures of myth because of the haunting sounds they make and their shining eyes