Assembly of Sloths

Affinity for Sloths (This spell costs {1} less to cast
for each Sloth on the battlefield you control.)
Whenever a Sloth enters the battlefield under
your control, you may reveal any number of Sloth
cards from your hand. Put X +1/+1 counters on
that creature, where X is the number of Sloth
cards revealed this way.
We are Sloths; We are Legion. Join us and obey the
will of the Sloth..