Magic: The Gathering - Duels of the Planeswalkers

CHALLENGE 1
Cast both Angelic Blessings on Skyhunter Skirmisher, then attack with it.

CHALLENGE 2
Cast Threaten on the Soul Warden. Cast Raging Goblin. Attack with everything.

CHALLENGE 3
Use Elvish Piper to put Roughshod Mentor in play. Attack with everything. Once the opponent declares blockers, cast all three Giant Growths onto a single Grizzly Bear that's blocked by one of the Civic Wayfinders.

CHALLENGE 4
Cast Megrim. Cast Ravenous Rats. Attack with everything.

CHALLENGE 5
Cast Elvish Warrior and Elvish Eulogist. Cast Eyeblight's Ending on the opponent's Nightmare. Use Immaculate Magistrate to put counters on Elven Riders. Attack with Elven Riders.

CHALLENGE 6
Use Prodigal Pyromancer to do 1 damage to your opponent. Boomerang the Persuasion on the Prodigal Pyromancer. Cast Persuasion on your opponent's Raging Goblin. Attack with Raging Goblin and Phantom Warrior.

CHALLENGE 7
Cast Terror on the Elvish Champion. Attack with everything, but as soon as you press Y to confirm the attack, press X to stop the countdown. Now use Flameblast Dragon to deal 3 damage to your own Sprouting Thrinax.

CHALLENGE 8
Cast Incinerate on the Royal Assassin. Cast Incinerate on the Ravenous Rats. Cast Pariah on Platinum Angel. Cast Sangrite Surge on Knight of the Skyward Eye, then use Knight of the Skyward Eye's ability to give itself +3/+3. Attack with Knight of the Skyward Eye and Mistmeadow Skulk. When you get to the damage step, your opponent's Dread will sparkle. Press X to stop the countdown. Use Brion Stoutarm's ability, sacrificing Knight of the Skyward Eye, dealing damage to YOURSELF.

Notes:
When I say "attack with everything," there may be some creatures who can't attack this turn, obviously they won't be attacking.

Sometimes you need to make unintuitive choices, such as damaging yourself. You may need to turn off "simplified targeting" in the options menu so you are given these choices.