Five mana for a 4/4 plus a 2/2 is great
You may pay optional additional costs, such as kicker, and if there are any mandatory additional costs, those must be paid to cast the spell
See where I'm going with this
Glimpse, the Unthinkable's second ability prevents it from being chosen for spells and abilities that specifically ask a player to "choose" or make a "choice" among creatures or other permanents, such as found on cards like Call to the Void, Divine Reckoning, and Vesuvan Shapeshifter
The reason for that was that Rith, the Awakener came along at the most favorable time in history for a good, large finisher in its colors thanks to the rise of Fires of Yavimaya
Formats and the player's advantage Because they are exposed to the formats most dependent on new sets, Draft and Standard players can accumulate a lot of data about what is happening in the secondary market