Commander creatures you own have "Whenever you cast a spell that shares a creature type with this creature, draw a card. This ability triggers only once each turn."

Flash Flying If an opponent would search a library, that player searches the top four cards of that library instead.

Flash {1}, Sacrifice this creature: Destroy target artifact or enchantment.

Flash If a nontoken creature would enter and it wasn't cast, exile it instead.

Flash When this creature enters, prevent all damage that would be dealt to you this turn. Whenever damage that would be dealt to you is prevented, put that many +1/+1 counters on this creature.

Flash Squad {2} (As an additional cost to cast this spell, you may pay {2} any number of times. When this creature enters, create that many tokens that are copies of it.) Benediction of the Omnissiah — When this creature enters, draw a card.