Ringo, Unpierced Doodle

{3}: Exile another target creature you control, then return it to the battlefield under its owner's
control.
Whenever another creature enters the battlefield
under your control, you may pay {g/w}. If you do,
put a +1/+1 counter on it. If it's a Unicorn, put
two +1/+1 counters on it instead.
"His life was two: first he was pierced; then he was unpierced..." -Wildman Steve Brill