Creature - Elemental Beast
When Gravesifter enters the battlefield, each player chooses a creature type, then returns any number of cards with that type from his or her graveyard to his or her hand.
5/7

Source: http://www.planetmtg.de/articles/artikel.html?id=6787
Dualcaster Mage 1RR
Creature - Human Wizard
Flash
When Dualcaster Mage enters the battlefield, copy target instant or sorcery spell. You may choose new targets for the copy.
2/2

Source: http://www.starcitygames.com/article/29 ... -Mage.html
Ob Nixilis of the Black Oath
Planeswalker - Nixilis
Loyalty: 3
+2: Each opponent loses 1 life. You gain life equal to the life lost this way.
-2: Put a 5/5 black Demon creature token with flying onto the battlefield. You lose 2 life.
-8: You get an emblem with "1B, Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature's power."
Ob Nixilis of the Black Oath can be your commander.

Source: @Wizards_MagicEU
Mothership:
Reef Worm 3U
0/1
When it dies but a 3/3 fish token into play that "has when it dies put a 6/6 whale token into play, that has "when it dies put a 9/9 kraken token into play.""

Freyalise, Llanowar's Fury 3GG
Planeswalker - Freyalise
Loyalty: 3
+2 put a 1/1 Elf druid into play that has "tap to add G to your mana pool."
-2 Destroy artifact or enchantment
-6 draw a card for each green creature you control
Freyalise, Llanowar's Fury can be your commander.

Myriad Landscape
Myriad Landscape enters the battlefield tapped.
T: Add 1 to your mana pool.
2, T, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle your library.
