Pegasus Foal

Flying, lifelink
When Pegasus Foal and at least one other creature attack, you may pay {1}{w} and Mature it. If you cast a creature card this way, put it onto
the battlefield tapped and attacking. (To mature Pegasus Foal, exile it. If you do, search your library for a non-Young creature card that shares a creature type with it. You may cast it by paying the difference in mana costs between it and this creature. Then shuffle your library.)