Price of Knowledge

Target player draws four cards.

Each player draws two cards.

When this enchantment enters, you may exile target artifact or enchantment. At the beginning of your upkeep, you may exile target artifact or enchantment. If you do, its controller gains control of this enchantment.

Flying 1GU: Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)

Whenever you gain life, put a +1/+1 counter on this creature.

Flying When this creature enters, exile target player's graveyard.

Flying, vigilance

This creature can't be blocked. When this creature enters, you gain 4 life. When this creature enters, sacrifice it unless U was spent to cast it.