Eua, Theatergoer of the Torus

Whenever a creature enters the battlefield under your control, you may pay {3}. If you do, create a token that's a copy of that creature, except it isn’t legendary and gains one of the following abilities:

• Lifelink, Trample, Haste, Menace, and +2/+2. Sacrifice this token at the beginning of the next end step.
•Sacrifice this token: It deals damage equal to its mana value to target creature.
•When this token is removed from the battlefield, gain {b} for each point of its power.