Struggle for Project Purity (Fallout)

Enchantment - As this enchantment enters, choose Brotherhood or Enclave.
¥ Brotherhood Ñ At the beginning of your upkeep, each opponent draws a card. You draw a card for each card drawn this way.
¥ Enclave Ñ Whenever a player attacks you with one or more creatures, that player gets twice that many rad counters.