This is the New Card Protect the King revealed early from the upcoming Hearthstone adventure One Night in Karazhan being released on 11th August.
The card text reads: For each enemy minion, summon a 1/1 Pawn with Taunt.
This is another card coming out of the chess game battle in the new adventure. There is some obobviou synergy with some of the Warrior taunt spells here so this will be an interesting card to try and slot into some new deck builds.
3 mana seems reasonable. If you’re under pressure on the board this card can be a comback mechanic in a control type of deck.