Doppelganger Burn

Whenever a creature you control with power 5 or greater enters, you may put two +1/+1 counters on it.

Whenever a nontoken creature you control enters, you may pay . If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent."

Whenever a creature you control with power 5 or greater enters, you may have this enchantment deal 5 damage to any target.