Carnival vs. Dark Rit
You control four Soul Wardens, a Yawgmoth's Bargain, a Cavern Harpy, and an Aluren. You have a Drain Life in your library. You have either a Dark Ritual or a Carnival of Souls in your hand, with two Swamps untapped. Which one do you prefer?
Mons Goblin Raiders vs. Raging Goblin
It is your fifth turn. Your opponent controls five untapped islands and a Statecraft. You control a Mountain. (You are likely losing this game.
) You have no cards in hand. The top of your opponent's library is, in this order, Mountain, Fireball. You are at 3. The top of your library is Mons/Rager, Shock. Your opponent is at 2. You draw either Raging Goblin or Mons Goblin Raiders. If you draw the Rager, you clearly attack this turn. Your opponent plays Tidal Wave and blocks. Statecraft prevents the damage. On your opponent's next turn, he plays Theft of Dreams, and wins that turn via Fireball.
Air Elemental vs. Morphling
Isty, I thought you would have caught this one! Cursed Totem is in play.
Hill Giant vs. Ancient Kavu
Your are playing U/R, with a lot of mana in play. Your opponent has a Galina's Knight, and is playing 5cU, also with a lot of mana in play. You have your Ancient Kavu/Hill Giant in play, and a Blue Elemental Blast in your hand, and nothing else. You are at 3. Your opponent attacks. If you have an Ancient Kavu, you clearly turn it colorless and block. Your opponent then plays three Wanderlusts on your Ancient Kavu. Because it is colorless, you cannot BEB it. During your next upkeep, you explode.
Durkwood Boars vs. Spined Wurm
Your opponent plays Swords to Plowshares.
Carnivorous Plant vs. Spined Wurm
See Durkwood Boars vs. Spined Wurm OR you control Spined Wurm/Carnivorous Plant. Your opponent has a bunch of Mountains. You are at 6 life. Your opponent is at any life total greater than 5. Your opponent has no cards in hand, neither do you. If you have the Wurm, you attack. Your opponent plays Ball Lightning and kills you on his next turn. OR, for still another option, your opponent plays with Lightning Blast.
Blaze vs. Disintegrate
You control a Recurring Nightmare, a Deranged Hermit (echo long since paid), and 4 squirrels. You are at 1. Your opponent 'Geddoned last turn, but you have two mana in the form of Diamonds. Your opponent is at 1, but controls 6 Saprolings, a Peacekeeper, and an Ivory Mask. You need to wait until next turn, being able to stop all of your opponent's Saprolings, and be able to attack back with enough to kill him. You draw either Blaze or Disintegrate. If you draw Blaze, you can sacrifice your Hermit, and bring him back with the Nightmare, giving you 7 2/2s and the Hermit. That's enough to stop the Saps, and attack back on the next turn. If you draw the Disintegrate, that's not possible, and you lose.
Blaze vs. Fireball
You are playing a burn deck. As a result, you have plenty of burn to reduce your opponent's life. Your opponent has two 1/1s and an excess of mana. You have a 15/15 creature in play that doesn't tap to attack. You are at 2. Your opponent is at 21. It is the beginning of your turn. The top four cards of your opponent's deck are (in this order) Mountain, Mountain, Mountain, Shock. For all intents and purposes, the remainder of your deck are lands, except the top card, which is Blaze/Fireball. You have 7 lands in play. You draw Blaze/Fireball. If it is Fireball, you likely try to deal 1 damage to each 1/1, and 1 to your opponent, ending the game that turn. Your opponent plays Confound, drawing a card. You attack, killing a 1/1. Your opponent draws his second land. You attack, killing a 1/1. Your opponent draws a third land. You attack, reducing him to 6. Your opponent draws Shock, and kills you. If you had drawn Blaze, you would have simply burnt your opponent, and he would have died one turn before drawing Shock.
(The Fireball one took me a while, and I don't think its as solid an answer as there could be. I'll come up with a better answer later, I promise, if that one is not satisfactory.)