Syr Merla Vahl Halla

Mentor (Whenever this creature attacks, put a
+1/+1 counter on target attacking creature with lesser power.)

When Syr Merla Vahl Halla enters the battlefield, it explores X times.

Whenever another creature you control explores,
and you reveal a non land, put a +1/+1 counter on
Syr Merla Vahl Halla.