If any don't suit them, they can swap them
This plays its best roles in go-wide, Proliferate, or artifact creature strategies where ED-E can either be enabled to the extreme, or it can synergize with other effects in the deck
This planeswalker is also great at protecting itself, as its second ability gives you both a body to block with and can serve as removal if you have enough creatures on the board
If your deck contains a bunch more energy cards, then the Tiger becomes more attractive
While at first some players (myself included) speculated that wiping the board of both yours and your opponents characters might not actually be all that advantageous, because Ruby has so much card removal it usually works out in your favor to hit a Be Prepared
We all know by now how good creature tutors are in Magic, and Speaker provides a very exciting new option in that category