Necromaster Dragon

Oracle Text

Flying

Whenever Necromaster Dragon deals combat damage to a player, you may pay 2. If you do, create a 2/2 black Zombie creature token and each opponent puts the top two cards of their library into their graveyard.

Card Rulings

2/25/2015 Necromaster Dragon’s last ability will trigger once for each player it deals combat damage to. For each of these abilities, you may pay only once.