Pairing Isperia with hand-reveal cards like Telepathy or Gitaxian Probe ensures you never miss
Basically, Battle Academy featured everything you needed to just play in one box
There are the cards that have a wide scope of uses or a wide range of allowable mana investments
The Magic Librarities site has a section devoted to oversized cards and shares what in their estimation are the earliest ones
Given the blue/green elf theme of scrying, you will have some amount of control over the top card of your deck, which means you should be able to set this up quite often
They do, of course, transform into Arlinn, the Moon's Fury , which also has four Loyalty and can gain two to add one Green and one Red mana, or you can just turn them into a 5/5 Werewolf with Trample, Indestructible, and Haste until the end of turn