(Challenge: make an iconic creature with iconic creature type)Nimda, Gravelling Wurm
Legendary Creature - Wurm
: Until end of turn, all lands are plains and you may spend white mana as though it were mana of any color. Play this ability only any time you could play a sorcery.
7/10Nimda cannot be seen until it attacks. You can hear it coming, though, a mile away.
(Challenge: make a card relating to silver.)Silver Mox
If ~ would come into play, you may sacrifice an artifact instead. If you do, put ~ into play. If you don't, put it into its owner's graveyard.
: Add one mana of any color to your mana pool.
(Challenge: make a fat elf.)Lunesylv, Demonic Tutor
Legendary Creature - Elf Demon
, pay 3 life: Search your library for a card and put that card into your hand. Then shuffle your library.
(Challenge: make a zombie.)Corpseling
Creature - Zombie Shapeshifter
: ~ gains lifelink until end of turn. Play this ability only once each turn.
: ~ gains fear until end of turn.
: Regenerate ~.
: ~ gets +1/-1 until end of turn.
: ~ gets -1/+1 until end of turn.
(Challenge: make a 1cc that is awesome with 2 drops.)Subverter Merfolk
Creature - Merfolk Rogue
Whenever a creature you control deals damage to an opponent, that player puts twice as many cards of his or her library into his or her graveyard.