Keita, Moonlit Black Cat

Team 4 (When this creature attacks, you may choose
up to 4 other target attacking creatures. Those creatures
become a team with this creature while they are
attacking.)
Level Up— If you have 3 or more experience
when Keita attacks, you may pay {x}. If you do,
search your library for a creature card with
"Moonlit Black Cat" in its card name and
converted mana cost of x or less. Put that card in
play tapped, attacking, and on Keita's team.