When Perrie enters the battlefield, put a
shield (If the creature would be dealt damage or destroyed, remove a shield counter from it instead.) counter on target creature.
Whenever Perrie attacks, target creature you control gains
trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) and gets +X/+X until end of turn, where X is the number of different kinds of counters among permanents you control.