Go to the Challenges menu and start a match against the last challenge of the newest magic DLC (DLC2, its a match against Sarkhan Vol with 1 Wall of Wood)
- Play a "Harrow" card and sacrifice any tapped land, put down 2 Forests. (2 MANA)
- Play another "Harrow" card and sacrifice any tapped land, put down a forest and any other mana of your choice. (2 MANA)
- Sacrifice your "Khalni Heart Expedition" enchantment in order to gain 2 more lands of your choice (2 MANA)
- Play your "Summoner's Pact" card and pick to bring back "Eternal Witness"
- Use the "Elvish Piper" that is already in play to summon "Eternal Witness", when "Eternal Witness" is summoned, use him in order to bring back a previously used "Harrow" card.
- Play the final "Harrow" card and sacrifice any tapped land, than proceed to play your last 2 mana. (2 MANA)