Akko, Inspired Artist

Mastery 1: Akko, Inspired Artist's base power
and toughness become 2/3. (When this deals
damage and survives, add to its mastery total.
When the mastery target is reached, gain the effect.)
Mastery 9: You get an emblem with "Whenever
a creature enters the battlefield under your
control, put three +1/+1 counters and a trample
counter on it."