Vesemir, Master of Witchers

Witcher 1 (When Blocking or blocked by a monster, this creature gets +1/+1 until the end of the turn)
All the Witchers you control have +1/+1.
If there is more than 3 witchers on your side of the battlefield, all the witchers have vigillance.
"Vesemir is the eldest and most experienced witcher; in fact, he may be older than Kaer Morhen itself."
-Geralt