Royal Crown of Deraville

Vow — At the beginning of each player's upkeep,
that player may vow to not put any +1/+1
counters on any permanents they control until
the beginning of their end step.
{4}, {t}: Look at the top 5 cards of your library.
You may put a knight or a card with Vow from
amongst them in your hand. Put the rest on the
bottom in any order.