Beidou, Ocean's Thunder

Whenever Beidou blocks, prevent all damage that
would be dealt to it and put that many +1/+1
counters on Beidou.

Whenever Beidou attacks, if it has 4 or more +1/+1 counters on it, Beidou gains trample and vigilance
until end of turn.

whenever an opponent casts a creature spell with
power 4 or greater, draw a card.