Egg with kings is 2, so it trades 2 for 2. It's still good with the spawn, though.Nerubian egg with kings, Trades 2 for 1 by itself, add in the spawn
Windfury harpy - 2 for 1 against hero power. Great for finishing burst with kings / might
Every 1 dmg minion will trade 1 for 1 with might, or 2 for 1 with kings
If it trades with might, it's not trading 1:1 - it's trading 1:2. See above for kings.
Not counting buff cards as a trade off is a mistake - it leaves you with an empty hand.