Warren, Founding Member

Flying, vigilance
Whenever Warren attacks, you may give one
other attacking creature you control flying until
end of turn. Untap that creature.
{2}{w},{t}: Exile target creature without flying,
then return it to the battlefield under its owner's control at the beginning of the next end step.
When Warren leaves the battlefield, you may pay {1}{b}{b}. If you do, you may return Warren,
Founding Member to the battlefield transformed.