Ayara's Oathsworn [March of the Machine: The Aftermath]

Set: March of the Machine: The Aftermath Type: Creature — Human Knight Rarity: Rare Cost: {1}{B} MenaceWhenever Ayara's Oathsworn deals combat damage to a player, if it has fewer than four +1/+1 counters on it, put a +1/+1 counter on it. Then if it has exactly four +1/+1 counters on it, search your library for a card, put it into your hand, then shuffle.