Elton John, Rabbit Prince

Eminence — Whenever another nontoken Rabbit creature enters the battlefield under your control,
if Elton John, Rabbit Prince is in the
command zone or on the battlefield, you may pay {1}. If you do, all Rabbit creatures you control
gain a +1/+1 counter.
{w}{u}{b}{r}{g}{t}: Exile the top 5 cards of your
library. You may cast any number of Rabbit
spells from among them this turn without paying
their mana cost. Activate this ability only
once each turn.