In order to make a great investment, we want to invest in cards which have: Low sentiment Low metagame percentage (relative to potential) Low format interest in the formats they're played in (relative to potential) The last two points are related to the dynamics and trends in the Magic marketplace
Blue simply does not provide adequate removal, protection, or win conditions, even considering the many complimentary artifacts that can be inserted into the Stasis shell
Kykar, Zephyr Awakener Bird wizards are historically powerful and cool cards, just look at Nadu, Winged Wisdom, Slickshot Show-Off, Derevi, Empyrial Tactician, and Oracle of the Alpha
Even Akroan Skyguard might have some value if youre just shoving all-in on heroic