Shark of Wisdom 4
Permanent
Deal 3 damage to the target creature.
Upped:
Shark of Wisdom 4
Permanent
Deal 4 damage to the target creature or player. If target creature is frozen, kill it. If target player's weapon is frozen, destroy it.
An alternative build would be to have swave on both unupped and upped, and just have the upgrade effect be reducing the cost of the shark. Not sure that aether needs more creature control, but I wanted to have at least one shark that is not a creature. If anyone has alternate ideas for a Shark of Wisdom, feel free to share them here.