Pennywise

Terrorize 3(When this creature enters the battlefield, distribute 3 terror counters among up to three different creatures. A creature is sacrificed if it has 5 or more
terror counters.)
{1}{u}{b}: Until end of turn, Pennywise becomes a
copy of target creature with a terror counter,
except it's a 4/4 and has this ability in addition to
the target creature's abilities.
When Pennywise deals damage to a creature, put
a terror counter on that creature.