Choose two colors. Add a mana of each of the chosen colors. At the beginning of your next upkeep, pay one mana of each of the chosen colors. If you don't, you lose the game.
The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way. At the beginning of your next upkeep, pay {1}{W}{W}. If you don't, you lose the game.
Search your library for a green creature card, reveal it, put it into your hand, then shuffle. At the beginning of your next upkeep, pay {2}{G}{G}. If you don't, you lose the game.