Seren, Lord of Mimicry

When Seren, Lord of Mimicry enters, put a flying counter on it if you control a creature
that has flying. Repeat this process for first strike, double strike, deathtouch, hexproof, indestructible, lifelink, menace, reach, trample,
and vigilance.

Seren gets +1/+1 for each different counter on
it.