Sapphire Seer is a Common Neutral Minion. She costs three cores, has two attack and two health as well as Forcefield. Forcefield can be very powerful as the enemy general cannot kill Sapphire Seer without the help of another minion or damaging spell. This stickyness makes Sapphire Seer a good card in board flood decks, as she survives things like Tempest without dying.
Like all Forcefield minions, dispel makes her near useless.
Sapphire Seer loses three stat points for Forcefield, making her stats comparable to Helm of MECHAZ0R which costs one core. Whether Forcefield is worth two mana is up to you. However even though she has very low stats, the nature of Forcefield lets her trade with almost any minion and buffs are extremely effective.
v. 0.61.0 - Added: Sapphire Seer 3 mana 2/2 Forcefield