Nuu, Alluring Desire [MST001] (Part the Mistveil)

Your attacks with Stealth get "When this chain link resolves, banish all action cards defending this." Instant — [3 Chi]: Look at the top card of an opposing hero's deck. If it's blue, you may banish it. Until end of turn, you may play blue cards from that hero's banished zone without paying their [1 Resources] cost.