Here is my top ten cards that gain life in the cube: 10
Varragoth, Bloodsky Sire Arent demons by their very nature a little roguish

Creatures (31) 1 Solemn Simulacrum 1 Platinum Angel 1 Duplicant 1 Flametongue Kavu 1 Brion Stoutarm 1 Pilgrim's Eye 1 Emrakul's Hatcher 1 Kozilek, Butcher of Truth 1 Ulamog, the Infinite Gyre 1 Wurmcoil Engine 1 Steel Hellkite 1 Palladium Myr 1 Jor Kadeen, the Prevailer 1 Zealous Conscripts 1 Ogre Battledriver 1 Burnished Hart 1 Iroas, God of Victory 1 Deal Broker 1 Oblivion Sower 1 Barrage Tyrant 1 Blight Herder 1 Desolation Twin 1 Emeria Shepherd 1 Kalemne, Disciple of Iroas 1 Kalemne's Captain 1 Kozilek, the Great Distortion 1 Goblin Dark-Dwellers 1 Endbringer 1 Linvala, the Preserver 1 Eldrazi Obligator 1 Eldrazi Displacer Planeswalkers (2) Lands (39) 10 Plains 1 Kor Haven 11 Mountain 1 Temple of the False God 1 Battlefield Forge 1 Keldon Necropolis 1 Boros Garrison 1 Terramorphic Expanse 1 Ancient Amphitheater 1 Mistveil Plains 1 Evolving Wilds 1 Command Tower 1 Buried Ruin 1 Boros Guildgate 1 Wind-Scarred Crag 1 Flamekin Village 1 Shrine of the Forsaken Gods 3 Wastes Spells (29) 1 Swords to Plowshares 1 Land Tax 1 Sol Ring 1 Lightning Greaves 1 Grab the Reins 1 Tithe 1 Honor the Fallen 1 Thran Dynamo 1 Orim's Thunder 1 Tormod's Crypt 1 Flash Conscription 1 Sunforger 1 Ghostway 1 Word of Seizing 1 Dawn Charm 1 Austere Command 1 Wild Ricochet 1 Armillary Sphere 1 Expedition Map 1 Everflowing Chalice 1 Eldrazi Conscription 1 Mass Mutiny 1 Order 1 Volcanic Offering 1 Profound Journey 1 Tragic Arrogance 1 Hedron Archive 1 Quarantine Field 1 Turn Against This deck is built around our good friend Kalemne and her forces

We suppose you could also try and get hold of one of the Power 9 cards within the $999 30th Anniversary edition
There are the obvious situations of I have none, you have lots, let me smash you, which have just punished someone for their ridiculous battlefield state
Check in tomorrow for a continuation of this exercise