Pain's Reward [Saviors of Kamigawa] 124 If those permanents are exchanged

If those permanents are exchanged this way

Kithkin healers chant the clan songs of both their parents over the broth to double its curative effect

Set: Lorwyn Type: Creature — Elemental Incarnation Rarity: Rare Cost: {3}{G}{G}{G} Trample

Set: Rise of the Eldrazi Type: Creature — Elemental Rarity: Mythic Cost: {2}{G}{G} Haste

/ But Cao Cao's vanguard

Pain's Reward [Saviors of Kamigawa] 124 If those permanents are exchangedSet: Saviors of Kamigawa Type: Sorcery Rarity: Rare Cost: {2}{B} Each player may bid life. You start the bidding with a bid of any number. In turn order, each player may top the high bid. The bidding ends if the high bid stands. The high bidder loses life equal to the high bid and draws four cards.