Leaf-Crowned Elder

After the kinship ability finishes resolving, the card you looked at remains on top of your library.

You play the revealed card as part of the resolution of this ability. It’s played from your library, not your hand. You choose modes, pay additional costs, choose targets, etc. for the card as normal when playing it. Any X in the mana cost will be 0. Alternative costs can’t be paid.

If you have multiple creatures with kinship abilities, each triggers and resolves separately. You’ll look at the same card for each one, unless you have some method of shuffling your library or moving that card to a different zone.