Bloodstained Mire [Khans of Tarkir] Human Cleric {1}{R}: Dragons you control get

{1}{R}: Dragons you control get +1/+0 until end of turn

Set: Commander Anthology Volume II Type: Sorcery Rarity: Common Cost: {7}{U} Delve (Each card you exile from your graveyard while casting this spell pays for {1}

Although some of the students quickly grasped the concept

(They can't be blocked as long as defending player controls a Forest

Bloodstained Mire [Khans of Tarkir] Human Cleric {1}{R}: Dragons you control getSet: Khans of Tarkir Type: Land Rarity: Rare Cost: {T}, Pay 1 life, Sacrifice Bloodstained Mire: Search your library for a Swamp or Mountain card and put it onto the battlefield. Then shuffle your library. Where dragons once triumphed, their bones now molder.