Zul’Ido, Menagerie’s Paragon

Flying, ward {x}, where X is equal to 1 plus the
number of +1/+1 counters on Zul'Ido
When Zul'Ido enters the battlefield, choose a
creature type.
Whenever you cast a spell of the chosen type, put
a +1/+1 counter on Zul'Ido for each different creature type among creatures you control. Then choose another creature type.