Clutchkeeper

As an additional cost to cast Clutchkeeper, you
may tap an untapped Dinosaur creature you
control. Clutchkeeper costs {x} less to cast,
where {x} is that creature's power.
When Clutchkeeper enters the battlefield, it
fights up to one target creature.
Whenever Clutchkeeper fights or attacks,
create two 3/3 blue Dinosaur creature tokens.