While exile is lovely and very scary to play against this card is too ineffective at doing what you mainly want it to do
Sealed product prices doubled and tripled
While Terra provides a continual means of milling and a mana-activated ability that brings creatures back from the graveyard, Celes only offers milling as her enter-the-battlefield effect
The card costs three Mana to suspend for three turns, and then comes in and reads, Starting with you, each player may put an Artifact, Creature, Enchantment, or Land card from their hand onto the battlefield
Spellspear swaps haste for trample, but that's more of a sidegrade trade than a straight nerf in most cases as far as Standard is concerned
Mirror-Mad Phantasm In addition to running plenty of big creatures and ways to bring them back, Reanimator decks also need cards that fill the graveyard