Elspeth, Gideon, and Ajani are good planeswalkers to have among your creature-heavy decks, and good examples are Gideon Jura, Gideon, Ally of Zendikar, Elspeth, Knight-Errant, and Ajani, Adversary of Tyrants
We have, of course, seen cards with abilities like these played consistently in competitive play, so its quite possible Pluto will see play as well
Proft's Eidetic Memory With Proft's Eidetic Memory on the battlefield, every extra card you draw becomes fuel for combat
But what about some of the other mechanics out there
After all fun should be the priority of the game, also if I may ask if you know anyone else that may be interested as we do need a few more to get this ball to begin rolling after all
Also, it can shrink down and kill indestructible creatures, can be used flexibly to leave you with the biggest, beefiest creature on the board and still wax all of your opponents stuff